Washington -- Senate Judiciary Committee Chairman Arlen Specter, a pro-choice Republican, strongly warned President Bush Monday against any "sharp turns" as he ponders a second Supreme Court vacancy. The prospect of that looming vacancy overshadowed the opening of Senate debate on Judge John Roberts, headed for easy confirmation to be 17th Chief Justice of the United States, replacing the late William Rehnquist, a conservative stalwart who died earlier this month. Bush is expected to name his choice for the second and far more pivotal vacancy left by retiring centrist Justice Sandra Day O'Connor as soon as the Senate votes to...