What do you think should happen to politicians who "suddenly" change party after being elected?

Two Florida "Democrats" have decided that they're really Republicans after all.

Rep. Hillary Cassel of Boynton Beach (who strangely faced no Republican opposition in her competitive district, but spent $30,000 of Democratic money), and Tampa Representative Susan Valdés.

What do you think should happen to politicians who "suddenly" change party after being elected?
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