Sen. Barack Obama shakes hands with supporters after speaking at a town hall meeting in Greensboro, N.C. (Alex Brandon / Associated Press)
Democratic presidential hopeful Sen. Barack Obama shakes hands with a young supporter after speaking at a town hall meeting in Greensboro, N.C. (Alex Brandon / Associated Press)
Democratic presidential hopeful Sen. Hillary Clinton speaks at a fundraising event at the Daughters of the American Revolution Constitution Hall in Washington. (Nicholas Kamm / AFP/Getty Images)
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Supporters of Sen. Hillary Clinton cheer as she speaks at a fundraising in Washington. (Nicholas Kamm / AFP/Getty Images)
Sen. Hillary Clinton speaks about the economy at Wake Technical Community College in Raleigh, N.C. (Charles Dharapa / Associated Press)
Republican presidential hopeful Sen. John McCain addresses supporters during the Orange County Hispanic Small Business Roundtable in Santa Ana. (Joshua Gates Weisberg / EPA)
Republican presidential candidate Sen. John McCain autographs a photograph after a campaign appearance in Orange County. (Mary Altaffer / Associated Press)
