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There is almost a zero chance that 4 years of a McCain presidency will affect Roe vs. Wade. There have been many Republican presidents since Roe vs. Wade and none have made more than a dent in the legislation. Prime example: George W. Bush is very anti-choice and he led the most anti-choice government in 1999 (in Texas) yet many women voted for him during two elections and he did not overturn Roe vs.Wade. So if Bush did not end Roe vs. Wade in eight years then a moderate Republican like John McCain has almost zero chance of doing so.