Celebrity Activists in 2012 Presidential Election | Pictures

The 2012 presidential election is tomorrow. Men and women across the country will head to the polls to cast their votes for President Obama or Gov. Romney; some people, though, have gotten a head start by voting early, including the president himself.

Election season has so far been full of celebrities stumping for their preferred candidates, and in the run up to Tuesday, many of the stars are busier than ever, regardless of their party preferences. Jon Hamm, Bryan Greenberg, Alicia Keys, and even the Hangover crew have stepped out for Obama, and Kid Rock's roused the Republican faithful for Romney. With just a few days to go until America decides, click through to see which celebrities have been busy getting political — and remember to cast your vote, whomever you're voting for!

Photos: Getty and Facebook users Obama For America, Obama For America, and Obama For America