Pennsylvania Democratic Primary: Polling and Delegates

Relying on Superdelegates

Both Sen. Hillary Rodham Clinton and Sen. Barack Obama would have to win the remaining primaries and caucuses by huge margins to reach the 2,025 plateau with pledged delegates alone, making it all but certain that superdelegates, who are not bound by the will of voters, will decide the party's nominee.

Current Clinton and Obama delegate standings and states/delegates remaining

SOURCE: State parties, Associated Press delegate count

Polling Pennsylvania Ahead of the Democratic Primary

Timeline: Clinton and Obama's poll numbers in Pennsylvania, December 2007-April 2008

SOURCE: Quinnipiac University polls November 2007 - April 2008. Results among likely voters in the Pennsylvania Democratic primary. November-December results among registered voters. Margin of sampling error varies, but is typically plus or minus three percentage points.

Exit Polls: Pennsylvania Democratic Primary

The preliminary exit poll results from the Keystone State show the demographic makeup of the Democratic primary electorate and how each group voted.

Exit poll results from the Pennsylvania Democratic primary

SOURCE: Preliminary results based on interviews with 2,217 Democratic primary voters in Pennsylvania as they exited 40 randomly selected precincts. The results have a margin of sampling error of plus or minus two percentage points. The poll was conducted by Edison/Mitofsky for the National Election Pool, The Washington Post and other media organizations. The NEP is a consortium of ABC News, CBS News, CNN, Fox News, NBC News and the Associated Press.