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Your knowledge of Roman Catholicism is clearly limited. Also, prior to attacking one of the largest, most unified, and most politically active religious denominations in the nation, a denomination with a real sense of paranoia about outsiders criticisming them, you might want to think how that attack would affect your candidates chances.
Honestly, not picking a Catholic is just one of the many many mistakes that John McCain made in picking his running mate (the biggest was probably picking someone vastly more popular than himself).
All these discussions however are moot until 2012.
As goes the economy, so goes the Whitehouse. McCain can't run from the Elephant on his ticket and it's failed policies.
Palin may be back in 2012 (assuming McCain doesn't drag her too far down) and then all these issues will again become relavent.