Is he pro-war? Did he vote for the invasion of Iraq "to protect the integrity of the United Nations," as Bush put it? If so, he sends at best a mixed message, but unbelievers will use this as reason to reject Christ. How can you be pro-life and pro-war? See my comments under Re: Obama speech inspires mass Quran distribution (news and Current Events) for more detail.
Most GOP politicians use the church to advance their own political ambitions. Our local Congressman comes to our church before elections and the ministerial staff makes a big fuss of him. It's sickening really.
When interviewed on rightwing talk show radio he comes across as just another Islamic hater and pro-killing machine politician.
I feel sorry for American missionaries in Islamic countries. They must spend half their day apologizing and explaining why you don't have to be Republican to be a Christian.