Well said. The same "conservatives" here who get on their moral high-horse whenever most politicians get caught with feet of clay will excuse Gingrich. Yet Gingrich is the worst candidate we have running precisely for the reasons you say. Politically, although he's generally conservative, he's all over the place on many issues. There's a real lack of character in this man, as much as I mostly agree with his politics.
Aside from that, I can't see how Gingrich wins the election if he gets the nomination. Not only has he made a lot of enemies in his own party, but moderates and independents will turn away from him in droves. There's a snooty lecturing quality to the way Gingrich speaks that, after awhile, is very grating. Obama is likely to win in a landslide. From my perspective, once again the Right is throwing an election.
Santorum's not perfect but he's a damned sight better than the current alternatives.