Hogwash. Barack Obama won the Presidency, and he won it in a walk. His party controls both chambers in the Congress. While he does not have a filibuster-proof majority in the Senate, he has a large majority.
Of course I would like to see a "mainstream" nominee from Obama--but Republicans have no right to expect it. ELECTIONS HAVE CONSEQUENCES, and we got pasted in 06 and 08. And by the way, I hardly think our friends on the left think John Roberts and Samuel Alito represented "mainstream" picks by George Bush--and we didn't care. We had the whip hand, and we used it.
What do we have? Well, we have the filibuster, and we ought to use it. But we shouldn't go around hoping that President Obama will all of a sudden see the light and nominate a moderate to the Supreme Court. That's lunacy.