Obama campaign offers to sell Romney's son a birth certificate mug

President Obama's campaign would be happy to sell Mitt Romney's son a birth certificate mug from the president's campaign store.

Romney's son Matt joked Friday that his father might release his tax returns when Obama releases his birth certificate.

The campaign tweeted from Obama's official Twitter feed: "Mitt Romney's son thinks President Obama should release his birth certificate. Guess he doesn't have one of our mugs? http://OFA.BO/N13uCf"

The mugs read "Made in the USA" under a photo of Obama, and included a replication of the president's birth certificate.

"There's really no way to make the birth certificate conspiracy completely go away, so we might as well laugh at it -- and make sure as many people as possible are in on the joke," the Obama campaign store posted.

Romney's son also used Twitter later in the day to apologize for "repeating a bad joke." 

Obama Campaign Manager Jim Messina had already capitalized on the comment in an email to supporters that slammed the "Tea Party line" and suggested they help "drive up the cost of this kind of politics."

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