At the 2008 Coachella festival in Indio, California, Pink Floyd co-founder Roger Waters promoted the candidacy of Barack Obama in typical Waters fashion: on the underside of a giant, inflatable pig. Though the hopes of many Obama supporters have, well, deflated since then, Waters says that another pro-Obama pig may make an appearance in 2012. “Why not? Yeah,” he told us at the the Ziegfeld Theater’s premiere of The Iron Lady last night. “We’re doing some gigs in North America this year. I think that would be a good thing. Certainly we should reelect Obama.” Maybe just try to tie those knots a little tighter this time.