Mitt Romney was poised to retake the lead in the Republican White House race as Floridians went to the polls in a crucial presidential primary contest, following a caustic final campaign blitz.
Romney - a multimillionaire and former Massachusetts governor - was hoping to score a big win to restore his status as the all-but-certain Republican nominee, after several days pounding his chief rival Newt Gingrich on the campaign trail.
A heavy loss to Gingrich in South Carolina shattered Romney's air of invincibility in the contest to face off against Democratic President Barack Obama in November, and set off an avalanche of negative ads that led to a toxic campaign climate in Florida.
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