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

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"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."