“You know, in the past, when people pointed out that something was inaccurate, why, campaigns pulled the ad,” Romney said on the radio. “They were embarrassed. Today, they just blast ahead. You know, the various fact checkers look at some of these charges in the Obama ads and they say that they’re wrong, and inaccurate, and yet he just keeps on running them.”As Sargent points out, "fact checkers have called out his ads as wrong, inaccurate, misleading or false again and again and again and again and again and again and again. If Romney pulled any of those ads, I’m not aware of it."
I would just add a supplement: Romney has been very specific about the extent of a candidate's responsibility for Super PAC ads that support his candidacy.
On January 16 of this year, Fox's Juan Williams, posing questions in a GOP primary debate, invited Santorum to follow up on a prior attack on Mitt's mendacity:
