When you need an assassin . . .

. . . hire a Republican:

Gov. Paterson's decision to go nuclear on Caroline Kennedy was a hatchet job run by a pricey out-of-state consultant who specializes in political scandals, disgruntled administration sources said.
Judy Smith, a Washington-based PR guru and former Bush White House deputy press secretary, orchestrated the ill-conceived character attack on Kennedy, sources said Sunday.

You don't get to be a deputy press secretary in a Republican White House without backstabbing half-a-dozen of your "good friends" to get there. It's a prerequisite for the gig. So when it came time to dump his "good friend" Caroline Kennedy, he hired an expert to do the dirty work.