“A combined 58 percent of voters are either uncomfortable (37 percent) or have reservations about (21 percent) Bernie Sanders’ 2020 bid. For Elizabeth Warren, it’s a combined 53 percent. And for Kamala Harris and Beto O’Rourke, it’s 41 percent of voters expressing either reservations or discomfort.” Given that the overwhelming number of voters know who Sanders is, there is no excuse — as there is for other candidates — that they have insufficient information to decide whether to vote for him. Sanders is about as well known as former vice president Joe Biden, yet the poll shows that Biden’s comfortable/uncomfortable rating (48/48) clearly outpaces Sanders’s (37/58).....

Sanders’s age, the “socialist” moniker he embraces and his 2016 campaign problem with women are not going to change during the race. It’s unlikely his personality or his familiarity with foreign policy will improve, either. (The guy is 77, and if we have learned anything from Trump, it is that septuagenarians don’t change their personalities nor attend to habitual deficits in knowledge.) Oh, and on Sunday he again promised to release his tax returns, which he promised over a month ago would be “soon.”