No wonder Trump won't show up on a debate stage. He's gotten to where he can barely keep it together in front of the adoring throngs at his campaign rallies. Somewhat smaller throngs, it must be said — but, hey, it's January, and everybody's seen The Trump Show many times by now.
Even so, that was a real humdinger the great man emitted the other day when he confused Nikki Haley with Nancy Pelosi, b…