The nomination of Harriet Miers to the Supreme Court has splintered President Bush's base and triggered a growing demand from his own supporters to withdraw her nomination. "What a stupid, stupid mistake," said Mark W. Smith, a member of the conservative Federalist Society who has actively supported Mr. Bush but wants to see the nomination withdrawn. "You cannot fix this for 25 years." Conservatives have stuck with Mr. Bush through the bloodiest and gloomiest days of the war in Iraq, held firm as administration officials are investigated for revealing a CIA operative's identity and given him a pass on the...