He officially announced his candidacy on March 9, 1999. After a poor showing in the Iowa straw poll, he withdrew from the race on August 16.
The conservative candidate made his announcement speech on April 21, 1999, but withdrew his candidacy after poor performances in the Iowa caucuses and New Hampshire GOP primary.
The former New Jersey senator officially announced his candidacy on Sept. 8, 1999. Bradley withdrew from the race on March 9, 2000, bowing to the inevitable nomination of Al Gore and endorsing the vice president he had bitterly contested in the primaries.
The only female candidate, Dole announced the formation of an exploratory committee on March 10, 1999. But before officially launching her campaign, she announced on October 20 that she would withdraw from the race, citing a lack of campaign funds.
The first candidate to announce his campaign on the Internet, Forbes made it official on March 16, 1999. After a disappointing third-place finish in the Delaware GOP primary, the millionare publisher called it quits on Feb. 10, 2000.
The Ohio congressman announced the formation of an exploratory committee on Feb. 15, 1999. Five months later, on July 14, he withdrew from the race and endorsed George W. Bush.
The radio and TV commentator officially announced his candidacy on Sept. 20, 1999. Keyes remained on the campaign trail until July 26, 2000, when he announced his support for the Bush-Cheney ticket.
The Arizona senator announced his candidacy on Sept. 27, 1999.
McCain suspended his insurgent presidential campaign on March 9, 2000, conceding the Republican presidential nomination to George W. Bush but vowing to remain "a force for change."
The former vice president announced his candidacy on April 14, 1999. Citing a lack of campaign money, he announced his departure from the race on September 27.
He officially announced his candidacy on Feb. 18, 1999. But on July 13, the New Hampshire senator announced that he would leave the Republican Party to run as an Independent. Then, on Oct. 28, 1999, he announced he would withdraw from the race, also citing a lack of funds.