Cain
Straussian
Actually, you're touching on an important point. I think this will prove to be a Pyrrhic victory for Democrats. Sure, the witch is dead, so to speak, but the balance of power on the Supreme Court is in jeopardy for the first time in decades. The last President to have an opportunity to replace a Supreme Court Justice of the opposing ideology was Bush 41 (George H. W. Bush). He got to replace two liberal ones, but he screwed up and nominated one replacement who was as liberal as the predecessor (i.e. Souter).
This should be a Democratic talking point. We've had a conservative Court for the past twenty years. Bush Sr. had the opportunity to replace liberal Justices with conservative Justices.
The threat to the status quo is a much bigger motivator to those who have more to lose (i.e. conservatives) than to those who have more to gain (i.e. liberals). You can be sure that this will turn out the Republican base for the election, if the Senate chooses to delay approval until next year (which I think it will).
This is an interesting prediction, and there is something to the psychology loss-aversion, but assuming Obama's nomination is not confirmed, the next President will likely get to choose more than one justice. Kennedy is 79, Ginsburg is 82, and Breyer is 77. This is not to say Democrats will think in that frame, but they should.
Like they care.