You missed the whole point, i.e. don’t tell me there is zero difference between The Evil Witch and McCain.
There are differences. I don't see them as particularly favoring McCain, though.
Actually, to the extent that Hillary's badness can be bounded, I would see McCain as worse. McCain's not going to put up any real resistance against the Democrats, and indeed will try to stop the rest of his party from doing so. He may start out by appointing a Judge Roberts, but when that gets voted down and Kennedy suggests Ginsburg II, I can't imagine McCain opposing that too strenuously.
McCain would be a liberal puppet who would push through about as much bad stuff as Hillary, but without the possibility of a conservative swing in 2012. Where's the advantage?