Some notable names in the field of potential presidential candidates:
DEMOCRATS
OFFICIALLY ANNOUNCED
Senator Joseph R. Biden Jr. of Delaware
Senator Hillary Rodham Clinton of New York
Senator Christopher J. Dodd of Connecticut
John Edwards, former senator from North Carolina
Mike Gravel, former senator from Alaska
Representative Dennis J. Kucinich of Ohio
Senator Barack Obama of Illinois
Tom Vilsack, former governor of Iowa
ESTABLISHING EXPLORATORY COMMITTEES
Gov. Bill Richardson of New Mexico
WIDELY MENTIONED
Al Gore, former vice president; from Tennessee
Gen. Wesley Clark, retired NATO commander; from Arkansas
OFFICIALLY NOT RUNNING
Senator John Kerry of Massachusetts
Senator Evan Bayh of Indiana
Senator Russell D. Feingold of Wisconsin
Mark Warner, former governor of Virginia
REPUBLICANS
OFFICIALLY ANNOUNCED
Senator Sam Brownback of Kansas
Representative Duncan Hunter of California
Rudolph W. Giuliani, former mayor of New York
Mitt Romney, former governor of Massachusetts
ESTABLISHING EXPLORATORY COMMITTEES
Mike Huckabee, former governor of Arkansas
Senator John McCain of Arizona
Tommy G. Thompson, former governor of Wisconsin
James S. Gilmore III, former governor of Virginia
Representative Tom Tancredo of Colorado
Representative Ron Paul of Texas
WIDELY MENTIONED
Senator Chuck Hagel of Nebraska
Gov. George E. Pataki of New York
Newt Gingrich, former House speaker from Georgia
OFFICIALLY NOT RUNNING
Senator Bill Frist of Tennessee