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All the hand-wringing here is just Dems doing what they always do when handed a golden opportunity on a silver platter: they sit around and worry how it might backfire if they dare to use it--and by backfire I mean that somebody somewhere might complain, in which case they would instantly back down and apologize. Reps just say "f*** you (sometimes literally) and the horse you rode in on" and never back down.
There are many ways to spin this to make Palin and McCain look bad (I saw an article yesterday that showed Palin's actual hand-written line-item veto to cut funding for pregnant teens in Alaska--tell me that can't be spun) but the Dems are probably going to let the Reps control the narrative as usual and allow them to turn this into the positive that the hand-wringers here are all moaning about. So people here are right to worry about how this could end up helping the Reps, but if they do, it will only be because the Dems let them get away with it. Again.