In the new blockbuster “The Dark Knight Rises,” the actor Morgan Freeman plays an aide-de-camp to Batman as the caped crusader battles the arch-villain Bane.

But in the battle for the White House, Mr. Freeman is backing President Obama. Last month, Mr. Freeman donated $1 million to Priorities USA Action, officials there said Thursday. The group, a super PAC backing Mr. Obama, has lately been broadcasting advertisements attacking the Republican candidate Mitt Romney for his tenure at Bain Capital, the private equity firm.

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“President Obama has done a remarkable job in terrible circumstances,” Mr. Freeman said in a statement, adding that Mr. Obama was “being targeted by hundreds of millions of dollars in special interest money.”

“Priorities USA Action is doing a great job of protecting the values I believe in,” Mr. Freeman said. “I am happy to help them and I hope others will do so as well.”

Mr. Freeman joins a growing roster of Hollywood supporters bankrolling the group, which has shown an uptick in recent fund-raising but remains far behind its Republican counterparts.

Other Priorities USA donors have included the producer Jeffrey Katzenberg, who has given $2 million to the group, as well as the directors J.J. Abrams and Steven Spielberg and the comedians Chelsea Handler and Bill Maher.

Earlier this week, Rush Limbaugh, the radio show host, suggested that the character Bane had been inspired by the company Bain in a bid by Hollywood liberals to tar Mr. Romney by association.

“Do you think that it is accidental that the name of the really vicious fire breathing four-eyed whatever it is villain in this movie is named Bane,” Mr. Limbaugh said, according to a transcript of the show.