PHILADELPHIA, Apr. 19 -- Sen. Barack Obama launched an array of attacks in the final weekend before the Pennsylvania primary, hoping to regain momentum and increase pressure on Sen. Hillary Rodham Clinton to drop out of the race for the Democratic presidential nomination. -
Obama Tries to Hold Off Favored Clinton in Pa.
PHILADELPHIA, Apr. 19 -- Sen. Barack Obama launched an array of attacks in the final weekend before the Pennsylvania primary, hoping to regain momentum and increase pressure on Sen. Hillary Rodham Clinton to drop out of the race for the Democratic presidential nomination.-
By Anne E. Kornblut and Shailagh Murray