Washington (CNN) Bernie Sanders is (almost-certainly-I-mean-let's-be-honest-with-each-other) running for president in 2020.

Lots of people think he is a top-tier contender -- and might even be sort of a co-favorite with former Vice President Joe Biden.

I am not really one of them. Or to put a finer point on it: I don't think Sanders' 2016 campaign -- in which he quite clearly overachieved -- is indicative of how he will fare in the 2020 race.

Here's one example why:

On Wednesday night, Sanders was asked by Anderson Cooper whether he was aware, during the 2016 campaign, of the allegations -- recently published by The New York Times -- of sexism and sexual harassment within his operation.