Jollyblogger has an excellent post about religion and politcs.
I'm a pretty conservative blogger, yet I've never claimed that one must be a conservative to be a Christian, though some might think I do. I've never claimed that my belief in small government and free-market capitalism is a requirement to be a Christian. I go to church in a pretty liberal denomination, the United Methodist Church. In my own congregation, there is no standard for political belief, all we require really is that we love and worship the Lord in unity. While we are united in our worship, we have a lot of diversity with respect to politics. In my own congregation we have people who support American involvement in Iraq, and those who oppose it. We have people who shoot guns (like me), and people who are active in the gun control movement, including our District Superintendent. Bottom line is that the Christian faith has a lot of room for different political beliefs.
(link via Lee Anne Millinger - Such Small Hands, and Joshua Claybourn)