SLIDESHOW
Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y, greets supporters as she makes a campaign stop at the Burger Activity Center in Austin, Texas, Monday, March 3, 2008. (AP Photo/Carolyn Kaster)
(Carolyn Kaster - AP)
Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y., speaks during a rally Monday, March 3, 2008, in Austin, Texas. (AP Photo/Harry Cabluck)
(Harry Cabluck - AP)
Democratic presidential hopeful Sen. Barack Obama, D-Ill., speaks at a town hall meeting with Dallas area students and families Monday, March 3, 2008, in Carrollton, Texas. (AP Photo/Rick Bowmer)
(Rick Bowmer - AP)
Democratic presidential hopeful Sen. Barack Obama (D-IL) and his wife Michelle greet supporters at a rally Monday, March 3, 2008 in Houston. (AP Photo/Pat Sullivan)
(Pat Sullivan - AP)
Democratic presidential hopeful Sen. Barack Obama, D-Ill., makes remarks during a rally Monday, March 3, 2008, in Houston. (AP Photo/Rick Bowmer)
(Rick Bowmer - AP)
Arya Kamangar from Merced, Calif., stands in the rain Tuesday, March 4, 2008, near a voting precinct in Columbus, Ohio. Heavy rain fell in much of the state Tuesday morning with a forecast of freezing rain, sleet and maybe snow by the time voting wrapped up by evening. Flood warnings were posted in some parts of the state. Ohio's presidential primary typically comes well after the nominee is decided. But as Obama and Clinton have remained in a tight race for nominating delegates, Ohio's contest is key. (AP Photo/Kiichiro Sato)
(Kiichiro Sato - AP)
Democratic presidential hopeful Sen. Barack Obama, D-Ill., makes remarks during rally Monday, March 3, 2008, in Houston. (AP Photo/Rick Bowmer)
(Rick Bowmer - AP)
Democratic presidential hopeful Sen. Barack Obama, D-Ill., makes remarks during a rally Monday, March 3, 2008, in Houston. (AP Photo/Rick Bowmer)
(Rick Bowmer - AP)
Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y, greets supporters as she makes a campaign stop at J.P. Henderson Elementary in Houston, Tuesday, March 4, 2008. (AP Photo/Carolyn Kaster)
(Carolyn Kaster - AP)
Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y, talks with media as she makes a campaign stop at a polling place at J.P. Henderson Elementary in Houston, Tuesday, March 4, 2008. (AP Photo/Carolyn Kaster)
(Carolyn Kaster - AP)
Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y, makes a campaign stop at a polling place at J.P. Henderson Elementary in Houston, Tuesday, March 4, 2008. (AP Photo/Carolyn Kaster)
(Carolyn Kaster - AP)
A voter casts her ballot in the primary election, Tuesday, March 4, 2008 in Columbus, Ohio. Ohio's presidential primary typically comes well after the nominee is decided. But as Obama and Clinton have remained in a tight race for nominating delegates, Ohio's contest is key. (AP Photo/Kiichiro Sato)
(Kiichiro Sato - AP)
Stephen Linsky, right, from Newton, Mass. an Obama supporter shakes the hands of Teri Palladino, left, from Syracuse, N.Y.,a Clinton supporter outside a polling place in Providence, R.I., Tuesday, March 4, 2008. Another Clinton supporter, Kyle Townsend, center, from Buffalo, N.Y.,watches. The Democratic primary between Sens. Barack Obama and Hillary Clinton, is expected to be close and has drawn more voter interest than usual this year. (AP Photo/Stew Milne)
(Stew Milne - AP)
Simone, left, and Vivian Punchak , twin 9-month-old girls, wait as their mother Amy Punchak votes in the presidential primary in Providence, R.I., Tuesday, March 4, 2008. The Democratic primary between Sens. Barack Obama and Hillary Clinton, is expected to be close and has drawn more voter interest than usual this year. (AP Photo/Stew Milne)
(Stew Milne - AP)
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., greets people during a visit to the Houston Livestock Show and Rodeo 2008, Tuesday, March 4, 2008, in Houston. (AP Photo/Rick Bowmer)
(Rick Bowmer - AP)
Republican presidential hopeful, Sen. John McCain, R-Ariz., talks to supporters during a campaign stop at Mi Tierra Cafe in San Antonio, Wednesday, Feb. 27, 2008. (AP Photo/Eric Gay)
(Eric Gay - AP)
Republican presidential hopeful, former Arkansas Gov. Mike Huckabee, and his wife Janet, arrives at a voting location, Tuesday, March 4, 2008, in Dallas. (AP Photo/Tony Gutierrez)
(Tony Gutierrez - AP)
Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y, visits with supporters as campaigns at Herrera's Mexican Cafe in Dallas, Texas, Tuesday, March 4, 2008, the day of the Texas presidential primary election. (AP Photo/Carolyn Kaster)
(Carolyn Kaster - AP)
Supporters of Democratic presidential hopefuls Hillary Rodham Clinton and Barack Obama cheer and hold up their signs at J. P. Henderson Elementary in Houston, Texas, Tuesday, March 4, 2008, before Clinton's campaign stop arrival. Voters in Texas, Ohio, Vermont, and Rhode Island go to the polls Tuesday in their state's presidential primaries. (AP Photo/Carolyn Kaster)
(Carolyn Kaster - AP)
Voters listen to debate at town meeting in Plainfield, Vt., Tuesday, March 4, 2008. With their presidential primary election suddenly relevant, Vermont voters are heading to the polls on a day when election officials expect heavy turnout. For the first time in recent memory, Vermont's Town Meeting Day presidential primary is playing a role in the selection of the Democratic candidate. Vermont is voting Tuesday along with Texas, Ohio and Rhode Island.(AP Photo/Toby Talbot)
(Toby Talbot - AP)
A line of voters cast their ballot in the primary election Tuesday, March 4, 2008 in Columbus, Ohio. (AP Photo/Kiichiro Sato)
(Kiichiro Sato - AP)
A voter enters the polling station at the Alcazar Hotel in Cleveland Heights, Ohio to vote in Ohio's primary election on Tuesday, March 4, 2008. (AP Photo/Amy Sancetta)
(Amy Sancetta - AP)
Democratic presidential hopeful Sen. Barack Obama, D-Ill., with his wife Michelle, left, talks to media on board their flight from Houston to San Antonio Tuesday, March 4, 2008. (AP Photo/Rick Bowmer)
(Rick Bowmer - AP)
Democratic presidential hopeful Sen. Barack Obama, D-Ill., and his wife Michelle wave to the crowd during a rally Monday, March 3, 2008, in Houston. (AP Photo/Rick Bowmer)
(Rick Bowmer - AP)
Republican presidential hopeful Sen. John McCain, R-Ariz. reads over his election night speech in his hotel suite in Dallas, Tuesday, March 4, 2008. (AP Photo/Stephan Savoia)
(Stephan Savoia - AP)
Republican presidential hopeful, Sen. John McCain, R-Ariz., speaks at a town hall meeting in Waco, Texas, Monday, March 3, 2008. (AP Photo/Gerald Herbert)
(Gerald Herbert - AP)
Julie Pipes dances to the music while waiting for Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y. to appear at her primary night rally in Columbus, Ohio Tuesday March 4, 2008 in Columbus, Ohio. (AP Photo/Carolyn Kaster)
(Carolyn Kaster - AP)
Republican presidential hopeful Sen. John McCain, R-Ariz. and his wife Cindy react as Fox News declares he has won enough delegates to be named the Republican presidential nominee in his hotel suite in Dallas, Texas, Tuesday, March 4, 2008. (AP Photo/Stephan Savoia)
(Stephan Savoia - AP)
Republican presidential hopeful Sen. John McCain, R-Ariz., and his wife Cindy reacts to news that he has won enough delegates to be named the Republican presidential nominee in his hotel suite in Dallas, Texas, Tuesday night, March 4, 2008. (AP Photo/Stephan Savoia)
(Stephan Savoia - AP)
Republican presidential hopeful, Sen. John McCain, R-Ariz., and his wife Cindy react to the crowd at his primary watch party in Dallas, Tuesday, March 4, 2008. McCain surpassed the requisite 1,191 GOP delegates to clinch the Republican presidential nomination. (AP Photo/LM Otero)
(Lm Otero - AP)
Republican presidential hopeful, Sen. John McCain, R-Ariz., reacts to the crowd at his primary watch party in Dallas, Tuesday, March 4, 2008. McCain surpassed the requisite 1,191 GOP delegates to clinch the Republican presidential nomination. (AP Photo/LM Otero)
(Lm Otero - AP)
Supporters cheer the primary election victories of Republican presidential hopeful, Sen. John McCain, R-Ariz., as they appear on large screen televisions at his primary election watch party in Dallas, Texas, Tuesday night, March 4, 2008. (AP Photo/Gerald Herbert)
(Gerald Herbert - AP)
Republican presidential hopeful, former Arkansas Gov. Mike Huckabee, right, drops out of the Republican presidential race at a primary watch party, Tuesday, March 4, 2008, in Irving, Texas, after John McCain clinched the nomination. "We kept the faith," he told his end-of-the-road rally. At left, Huckabee's wife Janet applauds her husband. (AP Photo/Matt Slocum)
(Matt Slocum - AP)
With celebration balloons falling Republican presidential hopeful, Sen. John McCain, R-Ariz., and his wife Cindy react to the crowd at his primary watch party in Dallas, Tuesday, March 4, 2008. McCain surpassed the requisite 1,191 GOP delegates to clinch the Republican presidential nomination. (AP Photo/LM Otero)
(Lm Otero - AP)
Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y. acknowledges supporters during a primary night rally Tuesday March 4, 2008 in Columbus, Ohio. Clinton is the projected winner of the Ohio primary. (AP Photo/Mark Duncan)
(Mark Duncan - AP)
Republican presidential hopeful, Sen. John McCain, R-Ariz., and his wife Cindy McCain react to the crowd at his primary election watch party in Dallas, Tuesday, March 4, 2008. (AP Photo/Gerald Herbert)
(Gerald Herbert - AP)
Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y. greets supporters during a primary night rally Tuesday March 4, 2008 in Columbus, Ohio. Clinton is the projected winner of the Ohio primary. (AP Photo/Carolyn Kaster)
(Carolyn Kaster - AP)
Democratic presidential hopeful Sen. Barack Obama D-Ill., speaks at an election night watch rally in San Antonio, Texas Tuesday, March 4, 2008. Obama won the Vermont primary for his 12th straight victory in one month's time, and he and Democratic rival Hillary Rodham Clinton are locked in a tight race in the Texas primary. (AP Photo/Alex Brandon)
(Alex Brandon - AP)
Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y. acknowledges supporters during a primary night rally Wednesday March 5, 2008 in Columbus, Ohio. Clinton is the projected winner of the Ohio primary. Chelsea Clinton is in the background. (AP Photo/Kiichiro Sato)
(Kiichiro Sato - AP)
Republican presidential hopeful, Sen. John McCain, R-Ariz., reacts to the crowd at his primary election watch party in Dallas, Texas Tuesday, March 4, 2008, after reaching the requisite number of delegates to win the Republican presidential nomination. (AP Photo/Gerald Herbert)
(Gerald Herbert - AP)
Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y. addresses supporters during a primary night rally Tuesday March 4, 2008 in Columbus, Ohio. Clinton is the projected winner of the Ohio primary. (AP Photo/Mark Duncan)
(Mark Duncan - AP)
Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y. reacts to supporters cheers during a primary night rally Tuesday, March 4, 2008, in Columbus, Ohio. Clinton is the projected winner of the Ohio primary. (AP Photo/Kiichiro Sato)
(Kiichiro Sato - AP)
Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y. acknowledges supporters during a primary night rally Tuesday, March 4, 2008, in Columbus, Ohio. (AP Photo/Kiichiro Sato)
(Kiichiro Sato - AP)
Democratic presidential hopeful Sen. Hillary Rodham Clinton, D-N.Y. acknowledges supporters during a primary night rally Tuesday March 4, 2008, in Columbus, Ohio. Clinton is the projected winner of the Ohio primary. Standing with Clinton is are Rep. Stephanie Tubbs Jones, D-Ohio, and Ohio Gov. Ted Strickland. (AP Photo/Mark Duncan)
(Mark Duncan - AP)
Democratic presidential hopeful Sen. Barack Obama, D-Ill., and his wife Michelle wave as they leave the stage during an election rally Tuesday, March 4, 2008, in San Antonio, Texas. Obama won the Vermont primary for his 12th straight victory in one month's time, and he and Democratic rival Hillary Rodham Clinton are locked in a tight race in the Texas primary. (AP Photo/Rick Bowmer)
(Rick Bowmer - AP)