Guide to presidential candidate withdrawals

— -- When the presidential candidates pulled out of the race:

Democrats

•Dec. 16, 2006:Indiana Sen. Evan Bayh announced he would not run for president two weeks after creating an exploratory committee for a possible bid.

•Feb. 23, 2007:Tom Vilsack, former governor of Iowa, withdraws because he cannot raise enough money to mount a credible campaign.

•Jan. 3, 2008:Sen. Joe Biden of Delaware and Sen. Christopher Dodd of Connecticut both withdraw after poor showings in the Iowa caucuses.

•Jan 10, 2008:Bill Richardson, former New Mexico governor, withdraws after poor showings in Iowa and the New Hampshire primary.

•Jan., 25, 2008:Rep. Dennis Kucinich of Ohio, who based his campaign on withdrawing U.S. troops from Iraq, leaves the race after garnering little support for his bid.

•Jan. 30, 2008:John Edwards, former North Carolina senator and vice presidential nominee, is the first major Democratic candidate to withdraw. He ran a populist campaign focusing on the needs of the poor. He pulled out after a third-place finish in the Florida primary.

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Republicans

•July 14, 2007:Jim Gilmore, former governor of Virginia, announces withdrawal citing a lack of support and the challenge of many states holding elections at the same time.

•Aug. 12, 2007:Tommy Thompson, former governor of Wisconsin, drops out after finishing poorly in a straw poll of Iowa Republicans.

•Oct. 19, 2007:Kansas Sen. Sam Brownback withdraws from the race saying he has run out of campaign funds after not doing well enough in the Iowa straw poll to attract financial support.

•Dec. 20, 2007:Rep. Tom Tancredo of Colorado, who had used opposition to illegal immigration as the centerpiece of his campaign, withdraws after he is convinced the issue has been brought to the forefront of the presidential race. He endorses former Massachusetts Gov. Mitt Romney.

•Jan. 19, 2008:Rep. Duncan Hunter of California drops out of the race the night of the South Carolina primary, the last in a series of poor primary showings.