$17 million purchases a big win in Florida for Mitt Romney.
Mitt Romney has won the Florida Republican presidential primary, Fox News projects.
The victory, in the GOP contest's biggest state to date, is likely to give the former Massachusetts governor a burst of momentum as he and Newt Gingrich battle for the lead in what has become an increasingly negative race.
With 61 percent of precincts reporting, Romney is leading with 47 percent. Gingrich has 31 percent, followed by Rick Santorum with 13 percent and Ron Paul with 7 percent.