Slate examines the subject of whether Newt Gingrich is more than merely an excitable boy:

Is Newt Nuts?

Consider the symptoms: Bouts of grandiosity, megalomania, irritability, impulsiveness, spending sprees …

… We’re quick to describe politicians whose views we find extreme or whose behavior seems odd as “crazy,” and perhaps anyone who runs for president in some sense is. But I’ve long wondered whether Newt Gingrich merits that designation in a more clinical sense. I’m not a psychiatrist, of course, and it’s impossible to diagnose someone at a distance. Without medical records that he hasn’t released, we can’t know whether Gingrich may have inherited his mother’s manic depression. Nevertheless, one observes in the former House Speaker certain symptoms—bouts of grandiosity, megalomania, irritability, racing thoughts, spending sprees—that go beyond the ordinary politician’s normal narcissism.

One possibility is that Newt suffers, and benefits from, the milder affliction of hypomania. In his 2005 book The Hypomanic Edge: The Link Between (a Little) Craziness and (a Lot of) Success in America, John D. Gartner, a Johns Hopkins psychiatrist, argues that this form of extreme optimism explains the achievements of everyone from Christopher Columbus to Andrew Carnegie. Gartner writes: “Hypomanics are brimming with infectious energy, irrational confidence, and really big ideas. They think, talk, move, and make decisions quickly. Anyone who slows them down with questions ‘just doesn’t get it.’” Hypomanics lack discipline, act on impulse, suffer from over-confidence, and often lack judgment.

Is Newt delusional? Yes… except… the world keeps conforming itself to his delusions, making them reality.

I mean, he was crazy to run… I mean, come on, a guy with his baggage? But now he’s the frontrunner.

He had the same thing happen in the early 90s. He was the mad insurgent, the bomb-throwing back-bencher who thought he was born to rule — but he became speaker. The world changed in order to fit his megalomaniacal delusion.