FACTBOX-Likely U.S. presidential candidates in 2008

(Reuters) - Here are some of the declared and potential U.S. presidential candidates for the Republican and Democratic Party nominations for the 2008 election.

In alphabetical order:

DEMOCRATS:

Announced candidates:

Joseph Biden, U.S. senator from Delaware and chairman of the Senate Foreign Relations Committee.

Chris Dodd, U.S. senator from Connecticut.

John Edwards, former U.S. senator from North Carolina and the vice presidential nominee in 2004.

Mike Gravel, former U.S. senator from Alaska

Dennis Kucinich, U.S. representative from Ohio and 2004 presidential candidate.

Barack Obama, U.S. senator from Illinois.

Tom Vilsack, former Iowa governor.

Formed exploratory committee:

Hillary Rodham Clinton, U.S. senator from New York and former first lady.

Bill Richardson, New Mexico governor.

Expected or possible candidate:

Wesley Clark, retired U.S. Army general and 2004 presidential candidate.

REPUBLICANS:

Announced candidate:

Sam Brownback, U.S. senator from Kansas.

Duncan Hunter, U.S. representative from California.

Formed exploratory committee:

James Gilmore, former Virginia governor.

Rudolph Giuliani, former New York mayor.

Mike Huckabee, former Arkansas governor.

John McCain, U.S. senator from Arizona and 2000 presidential candidate.

Mitt Romney, former Massachusetts governor.

Tom Tancredo, U.S. representative from Colorado.

Tommy Thompson, former Wisconsin governor.

Other expected or possible candidates:

Newt Gingrich, former U.S. House of Representatives speaker.

Chuck Hagel, U.S. senator from Nebraska.