(CNN) — The core of Hillary Clinton’s argument to superdelegates has been her electability – that she is the candidate most likely to beat presumptive Republican nominee John McCain in November. But according to exit polls, voters don’t share that view. In Indiana, Democratic primary voters were equally split over who was most likely to beat McCain, with both drawing 48 percent. And in North Carolina, voters gave the edge to Barack Obama: 54 percent thought he was more likely to win in November, while 40 percent [...]