Santorum has displayed childish behavior that should disqualify him for political office. I was a Santorum supporter until he began making so many off the wall remarks.
Now I can’t stand the sight of him.
He does not sound or act like a stable man.
You hit the nail on the head. He is unstable. He certainly does not act like a mature adult. Maybe the pressure is too much for him. He is not ready for Prime Time.