For a number of reasons. But rather than getting into the inside politics stuff, I'll just tell you why I didn't back Huckabee.
I think Huckabee is an excellent politician. I think he's the most capable presence I've seen in a Presidential debate at any time in my life, and probably the century. He's very skilled, articulate, and many of his public positions now are strong and clearly stated and supported.
His embrace of the Fair Tax, and even his willingness to consider such a radical change to the tax structure is a positive too.
But I have an intangible feeling about him that I find unsettling. I often refer to how he emerged from the very same toxic political cesspool that Bill Clinton crawled out of. And I think it'd be nearly impossible for him to win the general election. His association with religion is a huge turn off to many voters. Worse yet, he has a long record of sermons that can be easily used to represent him as a sexist, racist, zealot. While he's capable of defending himself and clearing up such charges, the damage is done when the allegation is initially made.
But the first problem I had with Huckabee, and it was the biggest, came when he released his foreign policy paper and it indicated to me that he was a man with a very limited understand of international relations and principles of foreign affairs. He was operating out of his league and I don't expect him to assemble a team of people that I would necessarily trust to advice him any better in the future.