In those states, that means a total of 5.4% of Democratic voters left the party. But note, as well, that 3.1% of Republicans left their party.
Reportedly, this election is going to include more independents than any in the last half-century. So the question becomes: How do Republicans capitalize on that fact without jettisoning their principles?
The answer could come down to temperament -- an issue ably discussed, in the context of the two frontrunners, by NRO's Yuval Levin, a former Gingrich staffer.