Lingering behind his eye contact is a measure of goodwill not infrequently clouded by slips of the tongue that feel careless and unforgivably cringeworthy. And let’s be honest: These slips seem to be happening more as he ages. In the last month, he has misremembered the locations of two mass shootings and mistakenly stated he was vice president during the 2018 Parkland shooting. He has implied that poor kids are primarily African-American. Last week, he was in Keene, N.H. — and called it Vermont.