Newt Gingrich's fortunes on the prediction betting website InTrade have collapsed in the past three days, amid an unrelenting assault from all sides in the Republican field. After pushing close to 40 percent on the site, he's down to a 16.5 percent chance of winning the nomination. Mitt Romney, who fell as low as 42 percent on the site last week, is back up to 64 percent. The radical swing is a reflection of the growing unease on all sides about Gingrich's viability as the nominee - and recent polling showing that Gingrich's rise to the top in Iowa was...
