Gary Hart accurately identifies the danger of a Newt presidency:

For one or two of us, Mr. Gingrich’s most troubling characteristics are his attention span of a precocious 3-year-old and his latent tendency toward grandiosity. Perhaps in coming years he will learn to be able to sit down for more than five minutes at a time and concentrate and focus on a single thought. That would certainly be helpful in the White House. At present, President Gingrich would make Bill Clinton look sedate. But a president with a messianic sense of destiny and conviction that he is on earth to fundamentally alter history, with a comparison of himself to Winston Churchill (who never exhibited such a sense), is nothing less than a dangerous thing.

Churn up a mixture of messianic destiny, widespread contempt for those who differ, and an almost manic restlessness and we might soon have a nominee for president who, if elected, would provide many Americans with a sudden interest in a rather long sabbatical in more traditional and predictable democracies, especially those without nuclear arsenal.

Newt spells Robespierre.