Just after the South Carolina primary, where Newt Gingrich won a dominating victory, the former speaker inched up to an almost 30 percent likelihood of winning the nomination, according to prediction market data. At the time, it was a major foray in Romney territory; the markets had given the former Massachusetts governor as high as a 90 percent chance of snagging the nomination in mid-January. Now it appears that Gingrich’s surge is dying. As of Thursday afternoon, he was back down to a 10.9 percent chance in the markets heading into the Florida primaries this Tuesday.

Gingrich’s plummeting odds correlate with a drop in the polls in Florida. Shortly after South Carolina, several polls gave him a meaningful lead of 9 points, 8 points, and 5 points. (And of course, like South Carolina, Florida borders Gingrich’s former home state of Georgia.) But more recent polls look increasingly promising for Romney, showing leads of 2 points, 8 points, and 8 points. The two large leads come from the same organizations that gave Gingrich 8 and 9 point leads just a few days prior. The markets also now favor a Romney victory in Florida, as the follow graph demonstrates:

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