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Obama campaign veterans and other Democrats are having some fun with the decision by their former opponent, Mitt Romney, not to run again. 

President Obama's 2012 campaign manager Jim Messina, who is now co-chairman of the pro-Hillary ClintonHillary Diane Rodham ClintonTrump campaign launches Asian Pacific Americans coalition Van Jones: A 'white, liberal Hillary Clinton supporter' can pose a greater threat to black Americans than the KKK Taylor Swift slams Trump tweet: 'You have the nerve to feign moral superiority before threatening violence?' MORE super PAC Priorities USA Action, tweeted:

Obama 2012 campaign spokesman Ben LaBolt tweeted an infamous video of Romney singing "Who Let the Dogs Out?"

Paul Begala, a former adviser in the Clinton White House and a Priorities USA adviser, tweeted a reference to the car elevator in Romney's California home used to portray him as out of touch. 

Former Rep. John Dingell (D-Mich.) tweeted a final punch.