Whatever happened in Newt's personal life can not be bad enough to overcome his year's of dedication to the conservative cause. He is the one national figure who can define and articulate the conservative agenda in a way that "Joe Six-Pack" understands.
Newt has a good deal to offer in the way of useful advice. But as a political candidate he is damaged goods.
He didn't just offend his base with his divorce troubles. During his last couple of years in office he betrayed his earlier ideals, bowing under the pressure of that enormous DNC propaganda campaign directed against him. He was no longer the old Newt who succeeded so well in the Campaign for America.
I would add that the religious right, so called, is a necessary part of the conservative movement. Anyone who thinks they can be dismissed or ignored is smoking something. Conservatives can only win with a coalition, in which the chief aims of the various groups are duly respected. Among those things that need to be respected, even if not everyone agrees, is the right to life and the importance of supporting healthy families for the good of our society.