DNC releases ad highlighting Huntsman attacks on Romney

"209 days later," text superimposed over a clip in the ad from the Huntsman campaign's presidential rollout reads. "No matter what he says today, here's what he said about Romney."

"I don't know that he can go on to beat President Obama," Huntsman says in the ad of the former Massachusetts governor. "If we were to talk about his inconsistencies and the changes on various issues we'd be here all afternoon."

Romney was the primary target of Huntsman's attacks during his campaign. But in announcing that he was dropping out of the race, Huntsman also endorsed Romney for president.

"I believe it is now time for our party to unite around the candidate best equipped to defeat Barack Obama. Despite our differences and the space between us on some of the issues, I believe that candidate is Gov. Mitt Romney," Huntsman said at the news conference on Monday.

While the Romney campaign has been fairly quiet with accepting Huntsman's endorsement, the DNC quickly jumped on comments that Huntsman had previously made criticizing Romney.

On Sunday, after the Huntsman campaign said it would make the Monday announcement, the DNC sent out an email to supporters listing past comments that Huntsman had made against Romney.

"While the Huntsman campaign tries to rewrite history, let us remind you of some of Jon Huntsman's greatest hits against Mitt Romney," the email read before listing some of Huntsman's attacks.