Article: The Candidates; No incumbent. No favorite. Anything could happen.(Presidential Candidates' Hillary Clinton, Barack Obama, Mitt Romney, Bill Richardson, John McCain)

Byline: Kenneth T. Walsh

It could be a campaign of historic "firsts." Americans could elect the first woman president in Hillary Clinton. Or the first African-American president in Barack Obama. The first Mormon, Mitt Romney. The first Hispanic, Bill Richardson. The oldest president, John McCain.

That's just for starters. The unique nature of the presidential field is reflected in the wild-card candidates still sitting on the sidelines, ranging from former Tennessee Sen. Fred Thompson to former Vice President Al Gore. They seem ready to pounce if the current contenders falter. "It's a race without an incumbent president or vice president," says ...

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