Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y, left, followed by her husband, former President Bill Clinton, center, and daughter Chelsea, right, waves upon her arrival at the Douglas Grafflin Elementary School in Chappaqua, New York, Tuesday, Feb. 5, 2008, to cast their vote in the New York Democratic primary.
Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y, turns towards the media as she prepares to cast her vote in the New York Democratic Primary, Tuesday, Feb. 5, 2008, in Chappaqua, New York.
Democratic presidential hopeful, Sen. Hillary Rodham Clinton, D-N.Y, speaks to the media as husband, former President Bill Clinton, left, votes, Tuesday, Feb. 5, 2008, in Chappaqua, New York.
Mike Huckabee
Republican presidential hopeful, former Arkansas Gov. Mike Huckabee and his wife Janet look over the ballot after the former governor voted in the presidential primary election at a polling place in North Little Rock, Ark., Tuesday, Feb. 5, 2008.
Republican presidential hopeful former Arkansas Gov. Mike Huckabee leaves a polling place in North Little Rock, Ark., after voting Tuesday, Feb. 5, 2008.
John McCain
Republican presidential hopeful, Sen. John McCain, R-Ariz., waves to supporters and media upon his arrival in Arizona at Phoenix Sky Harbor International Airport in Phoenix Tuesday, Feb. 5, 2008, for the Super Tuesday presidential primary election.
Barack Obama
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., goes to vote at Beulah Shoesmith Elementary School Tuesday, Feb. 5, 2008, in Chicago.
Democratic presidential hopeful Sen. Barack Obama, D-Ill., left, talks to his wife Michelle as they vote in the Illinois Primary at the Shoesmith Elementary School in the Hyde Park neighborhood of Chicago, Tuesday, Feb. 5, 2008.
Democratic presidential hopeful, Sen. Barack Obama, D-Ill., shows his voting receipt after voting in the Illinois Primary at the Shoesmith Elementary School in the Hyde Park neighborhood of Chicago, Tuesday, Feb. 5, 2008.
Mitt Romney
Republican presidential hopeful, former Massachusetts Gov. Mitt Romney and his wife Ann walk up the street from the Belmont Town Hall in Belmont, Mass., Tuesday, Feb. 5, 2008, after they voted in the Massachusetts primary.
Republican presidential hopeful, former Massachusetts Gov. Mitt Romney votes in the Massachusetts primary, Tuesday, Feb. 5, 2008, at the Belmont Town Hall in Belmont, Mass.
Republican presidential hopeful, former Massachusetts Gov. Mitt Romney, accompanied by his wife Ann, places his ballot into a scanning machine as they voted in the Massachusetts primary, Tuesday, Feb. 5, 2008, in Belmont, Mass.