From the Seattle Times:
In 1993, Democrat Bill Clinton faced an opportunity to nominate a replacement for retiring "conservative" Supreme Court Justice Byron White. There were no calls from the wacky left that Clinton was obligated to replace White with a conservative to satisfy some recently contrived status-quo requirement on the court. Clinton replaced White with an activist ACLU lawyer, well-known for her leftist positions, by the name of Ruth Bader Ginsburg.
So for all you liberals out there trying to invent some non-existent excuse to attack Bush's nomination to replace Sandra Day O'Connor: Get over it.