Dang, I keep messing up. First confusing the Bay state and now getting the election years wrong. Romney was 2012, long after Grandpa had died.Why would have have voted for a Mormon in 2008?
McCain is a Baptist, which is about as close as you can get to Presbyterian theologically on the conservative side (sans the whole immersion-sprinkling thing of course).
He wa spretty staunch Presbyterian. He would attend a Presbyterian church when he visited us instead of going to the Methodist church with us.