Here is an interesting tidbit from the Mississippi exit poll. Look at the percentage of Hillary Clinton voters who are dissatisfied with the idea of an eventual Clinton nomination:
A full 15% of voters who said they will be unsatisfied if she gets the nomination voted for Hillary Clinton. In contrast, only 4% of Obama voters say the same about their candidate.
Looking at other exit polls, we see a similar result. In Ohio, for example (which was also an open primary), 12% of those who would be unsatisfied with Clinton were Clinton supporters, while only 3% of those unsatisfied with an Obama nomination were Obama voters.
In Texas (open primary), 10% of those unsatisfied with a Clinton nod were Clinton, compared to Obama's 7%.
In Tennessee (also an open primary), 11% of those who would be unhappy with Clinton as nominee were Clinton voters, and only 4% of those unhappy with an Obama candidacy were Obama voters.
The phenomenon doesn't appear to be universal (in Wisconsin, for example, the numbers break down 4% for Clinton and 6% for Obama). But it is prevalent enough to merit a closer look. Why are so many Clinton voters in some states unsatisfied with the prospect of a Clinton nomination? Does that number reflect Republican crossover votes? A little mischief perhaps? After all, Clinton did dominate the Republican vote in Mississippi (75%-25%). Is a certain block of Hillary's "support," in other words, an effort to nominate a candidate they think will be "weaker" in the general election?
Or, on the flip side (and less likely, I think), are some voters picking the candidate they thing will be the "strongest," even if they don't necessarily like that candidate?
The same questions apply to Obama's "dissatisfied" voters, of course, but to a lesser degree.
Update: Sorry for jumbling the numbers, I misread the chart initially. The post has been slightly tweaked to reflect the correction.