Rush's point, in a humorous review of the Batman movie, was exposing the clever tie-in of the 'summer campaign' by Obama 2012 against Romney, by raising Bain (Capital) over and over in advertising, attempting to tarnish the company name, and through that effort attempt to smear Governor Romney... and the latest summer blockbuster movie, timed for release by Hollywood producers, having a arch villain named Bane, with the Obama folks trying to gain advantage via the phonetic comparison of the two names.
Actually, the Bane character's ideas seem to mirror President Obama's deeds over the past few years, and the Nation in the movie is drowning in "leftist programs" while its population suffers, and grows less than restful. Still, taking the advantage of Bane = Villain, and Bain = Romney, is good short term play for any campaign.