Tampa, Florida (CNN) – Ohio Sen. Rob Portman has agreed to play the role of President Obama in debate prep sessions with Republican presidential candidate Mitt Romney, two GOP sources tell CNN.

Portman, one of the Romney campaign's leading surrogates on the campaign trail and fundraising circuit, was approached by the campaign about the role earlier this summer and is being provided with briefing materials by top aides in Boston, one of the Republican sources told CNN.
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