Republicans
Arizona Sen. John McCain
Former New York City Mayor Rudolph Giuliani
Nebraska Sen. Chuck Hagel
California Rep. Duncan Hunter
Former Massachusetts Gov. Mitt Romney
Kansas Sen. Sam Brownback,
Colorado Rep. Tom Tancredo

Democrats
New York Sen. Hillary Rodham Clinton
Former North Carolina Sen. John Edwards
Illinois Sen. Barack Obama
Delaware Sen. Joseph R. Biden Jr.
Massachusetts Sen. John Kerry
New Mexico Gov. Bill Richardson
Outgoing Iowa Gov. Tom Vilsack
Ohio Rep. Dennis J. Kucinich