It's not quite so simple. Remember that Newton was highly religious. It would be hard to describe him as not having a fully functional brain.
Never forget Newton discovered Gravity rules when an apple fall on his head. That may induce a kind of heavy head trauma, so it's normal that he became highly religious.
Aren't you stuck with him for 7 years, since presidential terms are 7 years in France?
No, the constitution was modified in october 2000, so the presidential term is now 5 years (which will sadly be enough for him to completely ruin the country).
The answer to the question of Life, the Universe, and Everything is... Four day work week, Two ply toilet paper!