I don't think liberalism and Christianity are mutually exclusive. I think she is sincere.
I think their view of Christianity, and what they prioritize from what they learned from Christ, is much different than what conservatives see as important—which should surprise absolutely no one.
Actor John Fugelsang, for instance, is a devout Christian—and a hard-line liberal. His view of Christianity, and that of other liberal Christians like him, is that it calls on people to give to the point of poverty, and that leads liberal Christians to think they can use the government to force the rest of the masses to do the same. (It's a dangerous view in my opinion, since the scriptures also consistently warn against covetousness.)
But there is also a second kind of liberal Christian I have run to is the “superficial” Christian. The one, usually female, who listens to contemporary Christian music and thinks that they can somehow better themselves by running overseas on some mission trip to the third-world or campaigning for some social justice cause. They look like they have their stuff together, but they really don't understand what the gospel is all about. It's about saving souls, changing viewpoints, abandoning things like “mammon” and reckless pursuit of frivolous desires. Should one lend a hand to a neighbor in need? Of course. But that's just it: neighbor. We are called to care for those put in our path, not necessarily to go way out of our way to find people to help; one can easily see how quickly one could exhaust himself or herself without addressing the fundamental cause of the person's neediness.
All in all, the gospel leads me to a much more conservative approach to life than a liberal one.
