12/30/2011 04:54 pm ET

Obama's 2012 Campaign Fundraises Off Mitt Romney's Son's Birth Certificate Joke

President Barack Obama's re-election campaign is fundraising off of comments on Obama's birth certificate by Mitt Romney's son Matt.

Matt Romney joked in New Hampshire Thursday that his father would release his tax returns if Obama released his grades and birth certificate. "I heard someone suggest the other day that as soon as President Obama releases his grades and his birth certificate ... then maybe he'd do it," Matt Romney said in an exchange that was captured in a video by Patch.com.

After Matt Romney made the joke, his brother Tagg chimed in to say that it was not his father saying that.

"He has not said that he will not do it, and he's also not said that he will," Matt Romney said about whether his father would to release his tax returns. "I don't know the answer to that. I'm not sure he knows the answer to that, but he'll do everything that he needs to. He's certainly not afraid of anything, he's not hiding anything."

Matt Romney created a Twitter account Friday and wrote, "I repeated a dumb joke. My bad."

The Obama r-eelection campaign sent out a fundraising email Friday afternoon with the subject line, "The birth certificate thing again?"

"This is how the Romney campaign thinks it's going to win the Republican primary: by pandering to the dead-ender fringe of extremists who still question where the President was born," wrote Obama for America Campaign Manager Jim Messina. "We can't make them rewrite their talking points. But we can drive up the cost of this kind of politics."

The email also includes a link to mugs with the president's birth certificate on them. The president released a long-form version of his birth certificate in April.

The Obama campaign also fired back at Mitt Romney over Twitter, asking why Romney won't release his tax returns, and about his son's comments, linking to the mugs.

Romney has thus far declined to release his tax returns, breaking with the tradition of recent presidential and vice-presidential nominees. He also has not released his birth certificate.