Associated Press
In this May 11, 2012, photo Sen. Rob Portman speaks to supportersat the Lake Manor Restaurant in Mt. Orab, Ohio. President Barack Obama and his Democratic allies aren't waiting for Republican Mitt Romney to reveal his vice presidential choice. They're already trying to scuff up those considered by political insiders to be most likely to join the GOP ticket.  The president’s campaign started swinging at the potential Republican running mates, including Portman, this week while urging home-state Democrats to chime in about the shortcomings  (AP Photo/Al Behrman)

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