The desire for ideological perfection can result in a candidate who's un-electable, or who cannot compete effectively in a Jungle Primary where votes and loyalties are split so many different directions that NO Democrat rises to the top to compete head to head with the Republican. Or, worse yet... when feelings are hurt and disappointed supporters feel "cheated" that their preferred candidate didn't win, they opt to stay home and not vote in the General Election in order to "teach everyone a lesson" and to spite everyone rather than supporting the party's nominee thus handing the win to the Republican. (I'm not saying that will happen this time, but similar things have happened in the past, so it's always a greater than zero percent possibility.)
Wilson? Arnold? Damn... you ARE old! 
(I remember too.)
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