"If [Alito] is not qualified to serve on the Supreme Court, then no conservative is qualified." --Mark Levin
This is something that ought to be considered. If the possession of conservative ideology disqualifies a nominee, then likewise it would make sense that the possession of liberal ideology would disqualify a nominee. We confirmed Ginsburg [sic?], if you recall.
Also, keep in mind what a conservative judge is. Conservatism is the opposite of activism and radicalism. It is the preservation of things that have gone before. Original intent and precedent are what are important to conservative judges, not enacting social policies. Alito once struck down an anti-abortion law, despite his personal feelings on the issue. A non-conservative judge will not be bound by the Constitution or by precedent, and rule broadly based on his or her own feelings, drawing justification from the most unappropriate places (foreign laws should not be considered domestic precedent). The real fear is that the last bastion of liberal power is in danger of becoming what it was intended to be all along...an unideological body designed to interpret the Constitution, not administer social change. Democrats are desparate and they are going to fight tooth and claw for this. Like a wounded badger, my friends. It is going to be ugly but it was inevitable.
Kudos to Bush. You got your act together.