I frankly don't trust what the American Enterprise Institute usually has to say, but this one may be right. According to a former U.S. Treasury Peter Wallison, now at AEI, the U.S. taxpayer may lose $400 billion on the Freddie Mac and Fannie Mae bail outs. Here is the Bloomberg video interview

Taxpayers will lose more than $400 billion dollars

We noted Fannie and Freddie received an unlimited bail out, on Christmas Eve. no less (some present for the U.S. taxpayer!).