You've heard the news by now and to give you an indication of the politics involved, the guy has't even been buried yet and the debate about his replacement is being blasted all around the internet.
That shows you how bad the discourse is. No respect for the recently deceased.
I'll just say this. If the Republicans let Obama appoint a Justice then they lose the election. No if's and's or but's about it. Additionally the Republicans have shown that they lack a spine and have been constantly getting rolled by the Dems.
I expect them to cave on this issue, just as they've caved on others.