Presidential Election '08 (50 images)

Sen. Barack, Obama, (D-IL), battling Clinton for the Democratic nomination, waves to the crowd at a "Stand for a Change" rally at Seattle's Key Arena on February 8, 2008. (UPI Photo/Jim Bryant)

Republican Presidential candidate Sen. John McCain (R-AZ) speaks at the National Rifle Association (NRA) convention in Washington on September 21, 2007. (UPI Photo/Alexis C. Glenn)

Thousands of supporters wait to hear Democratic presidential hopeful Sen. Barack Obama (D-Ill.) and Oprah Winfrey at a rally at the Hy-Vee Conference Center in Des Moines, Iowa on December 8, 2007. Iowa voters head to the polls for a caucus on January 3, 2008. (UPI Photo/Brian Kersey)

Sen. Hillary Clinton, (D-NY) waves to the crowd as she campaigns in Seattle on February 7, 2008 before Saturday's presidential nominating caucuses in Washington. (UPI Photo/Jim Bryant)