The first allegation—that Mr. Romney "shipped jobs to China and Mexico"—was called "misleading, unfair and untrue" by the Washington Post fact checker and labeled "bunk" in an editorial. The Annenberg Center's FactCheck.org said it "found no evidence to support the claim that Romney...shipped American jobs overseas." Neither has anyone else. But Mr. Obama has not backed down, with his campaign spending more than $30 million to run TV ads on the subject for nearly three months.

The second charge—with its implied suggestion that perhaps Mr. Romney should be in jail rather than running for president—came in a July 12 conference call. Mr. Obama's deputy campaign manager, Stephanie Cutter, accused Mr. Romney of "misrepresenting his position at Bain" to the SEC, "which is a felony."

Read more: http://www.foxnews.com/opinion/2012/07/19/obama-down-and-dirty-campaign-tactics/#ixzz21IbD8arc