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If what those who keep screaming that PUMAs are Republicans want is to drive everyone out of the party who has questions about Obama, they may get their wish, but only temporarily.
The Democratic party doesn't belong to Obama, Clinton, Howard Dean or any other individual. It's a party that belongs to millions of people, who in the primaries split their votes almost evenly between the two candidates.
If Clinton had won, I doubt that her supporters would have spent nearly three months doing their utmost to further infuriate people who were already upset Obama didn't get the nomination.
If what you really want is to win the election, a strategy of including the Clintons and their supporters makes much more sense than a daily dose of insults and invectives.