Given that Trump is only articulate when he sticks to short sentences composed mainly of monosyllables, any Presidential picking on Joe will be kind of a glass houses thing. Really, Biden is more in the Thomas Jefferson mode: under the glitchy verbal processor is a pretty good brain. * For a 77 year old man who's been on the grueling stump road for over a year, I would say he's doing pretty well.
* Jefferson, whose IQ has been estimated in the range of 145-160, reportedly suffered from both stuttering and dyslexia.