you can also be Christian without be a Christofascist--without feeling like you need to have all of your Christian morals be federal or consitutitonal laws that apply to everybody just because you think God told you thats the way its supposed to be.
Frankly, I think you've got it wrong. I think the way to appeal to Christians is to say that legislating Christian morality opens the door to conflict between denominations.
There is virtually no generic Christian morality when it comes to the practices of people in their daily lives, and anyone who thinks so has got their head up their hindquarters. There are "blessed are the peacemakers" types, and there are "I come to bring not peace but a sword" types.
Huckabee is flat-out lying when he refuses to answer specific questions about his theology by saying that it's nitpicking. It matters very, very much to people whether they've got a statue of St. Patrick in their church or if they have a Bible lying on an altar in the front of their church or if they have a gay bishop.
The moment you bring Christianity into the public sphere, the question arises of whose Christianity.