Katy does another free concert Katy Perry Fri-02-Nov-12 17:39 Share this By Megan SlovakKaty Perry is set to stage a free concert in Milwaukee, Wisconsin this weekend to help rally last-minute support for incumbent U.S. President BARACK OBAMA ahead of the elections on Tuesday.The I Kissed A Girl hitmaker has become one of the politician's biggest celebrity supporters as he fights for a second term at the White House and she recently performed at a fundraising event in Los Angeles and at a campaign rally in Las Vegas last month, when she wore a white latex dress designed to look like ballot paper.The singer has now signed up to play her third pro-Obama gig in the swing state of Wisconsin on Saturday. She'll appear alongside the leader as part of a campaign to energise young citizens in the run-up to the big day.Perry isn't the only famous face putting in extra work ahead of the elections - actress Eva Longoria and singers Stevie Wonder, Marc Anthony and Dave Matthews are all due to appear at Democratic events in the next few days. You May Also Like Miley's pissed about Katy's kissing diss Who is the most streamed female artist in the world? Katy Perry the Aussie Weather Girl! Become a fan of The Edge on Facebook and on Twitter .