Sen. John McCain of Arizona and former Arkansas Gov. Mike Huckabee are in a close race for first in South Carolina, according to exit polls.
Former Tennessee Sen. Fred Thompson and former Massachusetts Gov. Mitt Romney are vying for third place in the pivotal Republican primary.

Results from the GOP primary come just hours after the Nevada caucuses.

Sen. Hillary Clinton won Nevada's Democratic caucuses and Romney claimed victory on the Republican side, according to CNN projections.

Democrat Hillary Rodham Clinton has pulled ahead of rival Barack Obama at the bank as well as in the polls and both continue to crush Republicans in the money race.

Clinton holds nearly $35 million three months before the voting starts, to Obama's $32 million.

The Republican money leader, Rudy Giuliani, reported $11.6 million in the bank for the primaries.

Clinton, who had trailed Obama in fundraising and in money in the bank at the end of June, edged past him with an aggressive third quarter of fundraising.

Sen. Hillary Clinton raised $27 million in the third quarter for her 2008 Democratic bid for the White House, a Clinton aide said Tuesday.

All but $5 million of Clinton's funds can be spent trying to win the Democratic presidential nomination in the primaries, the aide said.

More than 100,000 new donors contributed to the New York Democrat, the aide said.

Clinton outpaced Sen. Barack Obama over the last three months, a reversal of positions from the second quarter.

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Former Wisconsin Gov. Tommy Thompson said Sunday he is dropping out of the race for the Republican presidential nomination after finishing sixth in an Iowa straw poll.

"I have no regrets about running," he said in a statement released Sunday evening by his campaign.

"I felt my record as Governor of Wisconsin and Secretary of Health and Human Services gave me the experience I needed to serve as president, but I respect the decision of the voters. I am leaving the campaign trail today, but I will not leave the challenges of improving health care and welfare in America."