By Alec MacGillis Alaska Gov. Sarah Palin stood by her opposition to abortion in cases of rape or incest and her skepticism that global warming is caused by human activity, but she stepped back from her past position favoring the teaching of creationism in public schools. The comments came in Tuesday’s installment of her interviews with CBS News anchor Katie Couric. Several times in the interview, Palin answered questions about her stance on social issues by offering her personal
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