Dude, you're thinking is loopy. Even if the GOP had the nads to filibuster one attempted liberal replacement for Scalia, Thomas or Kennedy, they can't keep doing that for his whole term. And defeating one bad nominee doesn't guarantee the next attempts will be better. And the Supreme Court isn't the whole ball of wax either - there are all the circuit and appellate appointments too. You are taking an awful chance just assuming that Obama won't be able to replace a conservative judge. Additionally, Ginsburg will likely step down. That means there is at least a chance that Romney will be pressured by conservatives to nominate a conservative replacement that might shift the balance in our favor. Obama will replace Ginsburg with another leftist.
Look at Romney's appointments while he was governor of Massachusetts. Liberals all..
I don't believe what any politician says I look at their record Romney appoints liberal judges..