There are many good reasons not to Vote Newt for President, the best and most obvious reason being that you need to save your vote for John Bolton! Another good reason is because Newt Gingrich is a horrible cumsicle. Or maybe you refuse to vote for Newt because Newt loves the ladies so much, which is extremely gross to think about? That's Sen. Tom Coburn's (R-OK) reason, basically:

The right-wing senator said that while Gingrich is a “super-smart man,” he would not support him for president because he “doesn’t know anything about commitment to marriage,” referring to the fact that Gingrich has been married three times and committed adultery. He continued, “He’s the last person I’d vote for for president of the United States…he does not have a commitment to the character traits necessary to be a great president”