Clinton and Obama together would greatly drain my enthusiasm for Obama. It's already somewhat disturbing that he's getting DLC endorsements. Is he playing them or are they playing him?
And I don't think I'm alone in thinking too much closeness with the likes of Clinton will stain Obama. He may reach that point where he loses touch with the middle class sooner than expected if he gets too close.

Obama-Richardson... Now that would be a winning combo!
Hell, even Hillary and Richardson might work.
I think Richardson actually adds to a ticket... and he's in that weird middle ground where he's both establishment and not.

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"It's never over... BOY!"
The Tall Man, Phantasm III