A Supreme Court nomination, as George Bush has made clear, can be a president's greatest and most lasting legacy. It took bruising battles, but Bush brought real change to the court, which he turned to the right with his successful nominations of John Roberts and Samuel Alito.
The next president, whether it's John McCain or Barack Obama, can undo many of Bush's programs and policies. But he won't be in a position to change the Supreme Court until a justice or two decides it's time to go -- and even then, it depends on which justice retires and who is tapped (and confirmed) as the replacement.
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