Why the Zell Miller transformation?

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Zell Miller delivered a ferocious, fire and brimstone speech against John Kerry at the Republican convention in 2004.  Yet only three years earlier, he gave a very warm speech on Kerry's behalf:

http://www.alternet.org/election04/19761/

What happened?  Why did Miller make such a dramatic transformation at the end of his career?

When you're dealing with Palpatine there is no way of knowing what he's planning.

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It's because of politicians like Miller that people hate politics. The man is either an opportunist, a traitor or just simply insane.

Would you say the same thing about Lincoln Chaffe or Jim Jeffords? Or Miller is an admirable man for sticking to his values and principles instead of blindly following his party? What do you have to say to this?

Did Chaffe have some big conversion?

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Not sure how you can lump Zell in with a lot of people of both parties who have switched.