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Look, to all you who say this shouldn't be discussed -- it's the evangelical wing of the Republican Party that pushed McCain into picking Palin instead of Ridge or Lieberman because they're pro-choice. The same wingnuts who push publicly funded religious indoctrination that they call abstinence-only education. Looks like their abstinence only-approach doesn't work out so well. So now baby daddy, who doesn't want kids, has to get married because Miss Congeniality is running for VP. Better put down the stick and go to work at the cannery or pipeline.
The best theory I've seen, in the comments section at Fark, is that McCain picked Palin to appease the GOP just until the week is done. Then, safely out of town, Pailn can resign because her family needs her, and he can pick his Good Friend Joe.