There's about as much evidence for substantial mischievous crossover voting in open primaries as there is for voter fraud in general elections.

Like voter fraud, mischievous crossover voting merely serves as a ready-made excuse for supporters of a particular candidate.

Still, I'm sure we'll be hearing the same preemptive excuse-making in another 4 or 8 years, as we do every primary season. Que será, será.