It's something new every day, and often the new idea seems more colored by political opportunity than by practicality. How else to explain his savaging of the Ryan plan? Or his attack on corporate layoffs if a private investment company (with the name "Bain") happens to be involved? His hanging out on the third ring of economic hell, Fannie Mae? His support of, God forbid, "climate change" regulation?
Even if Newt had a good humored, Reaganesque personality, I'd be as worried about him betraying conservatives once in office as I am about Romney. But he doesn't have that personality. He's irascible, pompous, and petty. Often. I don't think he can win with that.
I'd guess Newt, like everybody else his age (or within 10 years of it) has been brought up on the idea of NOT messing with Medicare ~ like it's some sort of third-rail.
All that tells you is how out of touch with realpolitik you can get when you are busy making millions of dollars!
Catching Newt and others by surprise, we have moved on from the days of preserving Medicare at all costs ~ Obama actually cut it. I'd bet Newt is up to speed on that issue now.
You do realize that Newt believes GOD called him to run for President. This is hard work for a man his age ~ ask Herman Cain ~ God probably called him as well.
Remember, the Lord finds His prophets where He finds them ~ and He's not terribly concerned with the petty stuff.