WASHINGTON - Sen. Rick Santorum's leading Democratic challenger, Pennsylvania Treasurer Bob Casey, announced Tuesday that he endorses Judge Samuel Alito's confirmation to the Supreme Court.For weeks, Republicans have called Casey "Silent Bob" and pressed him to say whether he supports Alito's confirmation. Casey and Alito have a family connection because Alito, who serves on the 3rd U.S. Circuit Court of Appeals based in Philadelphia, sided with Casey's father, the late Gov. Bob Casey, in Planned Parenthood v. Casey. The case challenged a state law requiring women seeking abortions to notify their spouses."I do not agree with everything that Judge Samuel...