Matt Rourke, Associated Press
COLUMBIA, S.C. — Mitt Romney and Newt Gingrich collided Saturday in the South Carolina primary, the first Southern testing ground in the race for the Republican presidential nomination and historically a harbinger of the final outcome.
Rick Santorum and Texas Rep. Ron Paul rounded out the field in a campaign defined by its unpredictability.
There were 25 Republican National Convention delegates at stake, but political momentum was the real prize with the race to pick an opponent to President Barack Obama still in its early stages.
In all, more than $12 million was spent on television ads by the candidates and their allies in South Carolina, much of it on attacks designed to degrade the support of rivals.
Already, Romney and a group that supports him were on the air in next-up Florida with a significant ad campaign, more than $7 million combined to date. The state's primary is Jan. 31.
Interviews with voters as they left polling places showed nearly half saying their top priority was finding a candidate who could defeat President Barack Obama in the fall, followed by wishes for experience, strong moral character and true conservatism.
In a state with 9.9 percent unemployment, concern about the economy was high, and almost one-third of those voting reported a household member had lost a job in the past three years.
The exit poll was conducted for The Associated Press and the television networks by Edison Research as voters left polls at 35 randomly selected sites. The survey involved interviews with 1,577 voters and had a margin of sampling error of plus or minus 4 percentage points.
Romney, the former Massachusetts governor, swept into South Carolina 11 days ago as the favorite after being pronounced the winner of the lead-off Iowa caucuses, then cruising to victory in New Hampshire's first-in-the-nation primary.
But in the sometimes-surreal week that followed, he was stripped of his Iowa triumph — GOP officials there now say Santorum narrowly won — while former Utah Gov. Jon Huntsman dropped out and endorsed Romney and Texas Rep. Rick Perry quit and backed Gingrich.
Romney responded awkwardly to questions about releasing his income tax returns, and about his investments in the Cayman Islands. Gingrich, the former speaker of the House, benefited from two well-received debate performances while grappling with allegations by an ex-wife that he had once asked her for an open marriage so he could keep his mistress.
By primary eve, Romney was speculating openly about a lengthy battle for the nomination rather than the quick knockout that had seemed within his grasp only days earlier.
One piece of primary day theater failed to materialize when the two men avoided crossing paths at Tommy's Ham House in Greenville, packed with partisans holding signs that read either "Romney" or "Newt 2012."
Romney rolled in earlier than expected, and had left by the time Gingrich arrived.
Santorum got a lift hours before the polls closed when the Iowa Republican Party declared him the winner of the caucuses on Jan. 3. Romney was pronounced the victor by eight votes initially, but on Thursday, party officials said a recount showed Santorum ahead by 34. Even so, they declared the outcome a tie.
Santorum, a former Pennsylvania senator, pinned his South Carolina hopes on a heavy turnout in parts of the state with large concentrations of social conservatives, the voters who carried him to his surprisingly strong showing in Iowa.
Paul had a modest campaign presence here after finishing third in Iowa and second in New Hampshire. His call to withdraw U.S. troops from around the world was a tough sell in a state dotted with military installations and home to many veterans.
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