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IF he loses, which is still a coinflip, I am sure he will encourage all Democrats to back the winner.
If that winner is Edwards, then yes, he will have my vote. If it is HRC, against McCain, then I will cross party lines and vote for McCain.
He can tell me to do whatever he wants. Last I checked, this is a Democracy, and I will make up my own mind, which means that I will not vote for someone who is running a dirty campaign. Ever.