AdvertisementTo Prep For Debates, Stand-Ins Take The StageSeptember 30, 2012facebookEmailDuring the 2008 presidential debates, it was Ohio Sen. Rob Portman who stood in for Sen. Barack Obama when Sen. John McCain needed a practice partner. Portman is reportedly reprising his role this year for Gov. Mitt Romney. In Obama's corner, Massachusetts Sen. John Kerry will stand in for Romney. (AP)