This article by Glenn Kessler of the Washington Post in the Fact Checker column analyzes Mitt's statements about the history of presidential candidates and their tax returns. I guess either Mitt needs to either go back to history class, or he needs to stop trying to twist the facts (i.e. lie) to make this situation go away.
other Fact Checker columns from The Post :
http://www.washingtonpost.com/blogs/fact-checker