Jay-Z performed an energetic set and introduced Barack Obama in Ohio on Monday. Though the rapper "s voice was noticeably hoarse, the election eve performance picked up when he debuted a special version of "99 Problems."

The normal lyrics for the song are "If you "re having girl problems I feel bad for you son, I got 99 problems but a b-tch ain "t one." On Monday, Jay tweaked them: "If you "re having world problems I feel bad for you son, I got 99 problems but a Mitt ain "t one."

After noting that he "didn "t get that one vetted [by the campaign]," Jay ripped through the track. He punctuated the rest of his set, which included mainstays like "Run This Town," "Public Service Announcement" and "On to the Next One," with parroted Obama campaign slogans. "Are we ready to move forward Ohio?" he yelled. "Forward!"

"This is testament to how someone "s voice can be so powerful, that we "re standing in Ohio. I got a phone call, like "Jay? I need you down in Ohio. I need you to come down with the Boss. " And I said, "Michelle "s coming? "" Jay joked. "And [Obama] said, "no, Bruce Springsteen. ""

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