I have always believed that my faith has a public dimension. That is, my faith should guide the way in live in public. As a Christian that means Jesus should be the norm for my actions and beliefs. I may not always live out these beliefs fully and completely, but that is my intention. In every age we must figure out how this is going to work. Modern American political life is not the same is the first century Roman imperial context in which Jesus acted and Paul wrote. No voted for the emperor or Herod or any other political leader. People might not like the choices their presented with in the contemporary American political scene, but there are choices that are to be made.
I have written variously on matters of faith and politics. I think we need to have conversations about their intersection, lest we fail to understand how they connect. Too often we have equated God's realm with the political realm, as if creating a "godly kingdom" or "Christian America" will be the harbinger of the kingdom of God. But such is not the case. That doesn't mean that God is not active in our world (and even active beyond the church). I cannot enact the kingdom through my political acts, but the kingdom can guide my political involvement.