The sad and scary thing is that the "nice" christians usually aren't the ones who make the loudest noise and influence their flocks to vote a certain way. The nice christians realize that nothing good comes from the commingling of church and state. There is a growing distaste with factions of organized religion in this country with their loud and insistent clamor that may harm the good work done by others.<quoted text>
I don't doubt that some self proclaimed Christians teach that. However I also don't believe that is true of all Christians.
Some would say that Jesus was pretty clear what the core teaching was in his statement in Matthew 22:36. To paraphrase, love God and love your neighbor as yourself.
It's in the best interest of those more moderate and true christians to rein in their misguided brethren and set them back upon the true path.