From what I've heard about the Passion of The Christ movie, the suffering and death of Jesus is extremely intense. He is willing to suffer such horrendous treatment and death without resistance, with a larger heavenly purpose in view.
When it comes to the Gospel and how it's preached in church, by now His suffering has become something very "normal" and domesticated. The typical application of Gospel teaching is one of Jesus' example to guide our behavior; but since his suffering is fairly domesticated and palatable, the example leads to more conservative views and behavior.
My little thesis for this entry is that the intensity of Jesus' suffering as portrayed in the film may break some of this normal domesticated outcome. A person might have a real awakening and see Jesus' example as something above and beyond typical conservative hopes and outcomes.
Of course I don't know any of this for sure; just a guess and maybe a hope of my own!
For conservative voters who are also people with a deep faith, they might come to see this-world politics as not as meaningful as this kind of suffering. And so become somewhat disengaged. See where I'm going with this?
Maybe they, with the background of an application of following Jesus' example will be moved to do so in more of a spiritual way and less in a political way. It could be that one real reaction might be to lift their thoughts from affecting positive change through corrupt political action, thereby leaving this realm to others, i.e., the Democrats.
Just some thoughts!