The polls suggest Republicans will gain seats this year, but why does one GOP pollster suggest the shift could be anywhere from 60-100 seats? Are voters returning to the Republican Party or are they just furious at the Democrats? How big is the enthusiasm gap between supporters of the two parties? How certain are voters about whom they will support more than five weeks before the elections? And will a barrage of negative ads help the Democrats? We ask David Johnson, CEO of of the polling firm Strategic Vision.
