Thanks for pointing it out, Hesiod.  I've long thought that this threat to remove support of the other candidate is just that...a threat.  In the end, they will grudgingly admit the winner is not so bad and cast their vote for him--uhm, them.
Though I, after the last 3 weeks, have decided to vote for Nader if our nominee is Hillary.  After her "kitchen sink" strategy, and willingness to destroy the party over her own ambition, I can not support her.  Ever.  She has a lot to learn about life and the Oval Office isn't the place to learn it.