Pop singer Katy Perry performs before President Obama arrives at a campaign event on Saturday, Nov. 3, 2012, in Milwaukee. "Forward," Mr. Obama's campaign slogan, is emblazoned on her dress. (AP Photo/Morry Gash)
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Pop singer Katy Perry performs before President Obama arrives at a campaign event on Saturday, Nov. 3, 2012, in Milwaukee. "Forward," Mr. Obama's campaign slogan, is emblazoned on her dress. (AP Photo/Morry Gash)
