Because it won't stop her confirmation for the Supreme Court, and you know it. The Dem Socialists own the Senate and the Senate committes. Nothing can stop her confirmation. When you are the Senate majority, you can stop a nominee or two before you have to take what is shoved down your throat. Not so when you are the ball-less minorty with no power whatsoever.
So what if Kagan was blocked? Do you think the next nominee and the next would suddenly be orignal-intent Constitutionalists? No, they too would be hard communists. You let a radical communist get elected - you get hard communists for SCOTUS jurists. That is how that works.
Letting a radical communist like Obama select communist SCOTUS jurists is the result we are getting because "principled" conservatives could not hold their noses and vote for that idiot McLame. No matter how bad he would be, he would not have nominated hard communists to the Supreme Court, and you know it.
Nope, but maybe forestall it until the election, couldn't hurt.