Democratic Debate (14 images)

Hillary Clinton studies her notes as Barak Obama passes behind her during a break in their televised debate at the Kimmel Theater at the National Constitution Center in Philadelphia on April 16, 2008. (UPI Photo/John Anderson)

Supporters for Sen. Hillary Clinton (D-NY) gather outside the National Constitution Center before her debate with Sen. Barack Obama (D-IL) in Philadelphia on April 16, 2008. (UPI Photo/John Anderson)

Sen. Hillary Clinton (D-NY) (L) speaks at a Democratic presidential debate with opponent Sen. Barack Obama (D-IL) at the National Constitution Center in Philadelphia on April 16, 2008. (UPI Photo/John Anderson)

Hillary Clinton talks with members of the audience in the Kimmel Theater at the National Constitution Center in Philadelphia on April 16, 2008 following her debate with Democratic rival Barak Obama. (UPI Photo/John Anderson)