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Sportsbook.com currently has odds posted on this subject:

Who will win the 2008 U.S Presidential election?

2008 Presidential Race (All Bets Action)

Hillary Clinton 8-5

Al Gore 4-1

John McCain 6-1

George Allen Jr 25-1

Rudy Giuliani 2-1

Sam Brownback 25-1

Bill Richardson 20-1

Mark Warner 20-1

Mitt Romney 7-1

Mike Huckabee 30-1

Evan Bayh 25-1

Chuck Hagel 25-1

Colin Powell 25-1

Joe Biden 30-1

Bill Frist 50-1

John Edwards 7-1

Newt Gingrich 40-1

Tom Vilsack 50-1

Russ Feingold 50-1

Barack Obama 7-2

Rick Santorum 60-1

Tom Tancredo 60-1

Mike Gravel 60-1

Tom Ridge 60-1

Tom Daschle 60-1

Bill Owens 60-1

Bob Kerrey 60-1

John Kerry 30-1

George Pataki 50-1

Condoleezza Rice 20-1

Gary Locke 100-1

Dick Gephardt 100-1

Wesley Clark 20-1

Dick Cheney 75-1

Howard Dean 100-1

Alberto Gonzales 100-1

Bob Ehrlich 100-1

Charles Schumer 100-1

Harold Ford Jr 100-1

Jack Kemp 100-1

Jeb Bush 100-1

Jay Rockefeller 100-1

Ralph Nader 100-1

Paul Bremmer 150-1

Joe Lieberman 150-1

Bob Graham 150-1

Michael Bloomberg 150-1

Tommy Franks 200-1

Jesse Jackson 200-1

George W Bush 200-1

Dennis Kucinich 200-1

Arnold Schwarzenegger 250-1

Bill Clinton 300-1

Paul Wolfowitz 750-1

Alan Keyes 750-1

Elizabeth Dole 750-1

Clint Eastwood 750-1

Ted Kennedy 750-1

Bill OReilly 750-1

Laura Bush 500-1

James Carville 1000-1

Jesse Ventura 1000-1

Al Sharpton 500-1

John Ashcroft 1500-1

Donald Rumsfeld 500-1

Pat Robertson 2000-1

Bill Maher 2500-1

Donald Trump 1000-1

Michael Moore 1000-1

Chris Dodd 50-1

Doug Stanhope 25-1

Wayne Root 1000-1