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Katy Perry."America Forward!" Grassroots event with President Obama in Las Vegas, Nevada, USA. .October 24th, 2012.on stage in concert live gig performance performing music full length white dress singing writing president of the united states singing boxes black barack illinois joe biden delaware mitt romney massachusetts arm hand red shoes dancing leg foot up.CAP/ADM/MJT.© MJT/AdMedia/Capital Pictures.