David Cohen, a longtime confidant of former Gov. Ed Rendell, stunned Democrats and Republicans alike when he announced he was supporting Gov. Corbett. Robin Kolodny, an expert on political parties at Temple, said the Cohen announcement was inconsequential to prospective Democratic challengers. “If I were any of these Democratic candidates, I wouldn't let that bother me one little bit,” Kolodny said. “This governor's popularity ratings are so far down that it's almost too delicious for the Democrats to consider.”