There's a lot of information out there. We know he's the Republican nominee for U.S. President. So here's very small bit. (And please don't snipe, I'll be looking for more to get a fuller picture.)
Republicans endorsed McCain because he is a Republican, not an independent or "maverick." If you're a Republican who liked George W. Bush's policies, McCain is a good choice for you. If you're anyone else, you might want to take this Challenge-Bush or McCain?