Joe Biden’s NATO presser wasn’t a total trainwreck, but it did come off the tracks, especially when he called Donald Trump his vice president. The presser, which lasted just under an hour, supposedly was well-received in Biden land. That’s not necessarily an achievement; all Biden had to do was not fall over. It has become a Rorschach test of sorts, with people on both ends of this in the Democratic Party seeing whatever they want to see. Biden supporters think he “stuck the landing,” while...