"Firearms stand next in importance to the Constitution itself. They are the American people’s liberty teeth and keystone under independence."
— George Washington
"Patriotism is supporting your country all the time, and your government when it deserves it."
— Mark Twain
"You want to get rid of drug crime in this country? Fine, let's just get rid of all the drug laws."
— Ron Paul
"Firearms stand next in importance to the Constitution itself. They are the American people’s liberty teeth and keystone under independence."
— George Washington
"Patriotism is supporting your country all the time, and your government when it deserves it."
— Mark Twain
"You want to get rid of drug crime in this country? Fine, let's just get rid of all the drug laws."
— Ron Paul
"Has the whole world gone crazy? Am I the only one around here who gives a shit about the rules? Mark it zero!" - Walter Sobchak

I don't know, do you?
To me it seems that it's against Mitt Romney, but that leaves the question GRC already asked in the OP. Revenge for what? For supporting policies that threaten the President's supporters?
Like FAL said, this statement on the President's part was certainly meant to provoke an emotional response.
"Has the whole world gone crazy? Am I the only one around here who gives a shit about the rules? Mark it zero!" - Walter Sobchak
"Has the whole world gone crazy? Am I the only one around here who gives a shit about the rules? Mark it zero!" - Walter Sobchak
"Firearms stand next in importance to the Constitution itself. They are the American people’s liberty teeth and keystone under independence."
— George Washington
"Patriotism is supporting your country all the time, and your government when it deserves it."
— Mark Twain
"You want to get rid of drug crime in this country? Fine, let's just get rid of all the drug laws."
— Ron Paul