He winds up a pretty good glass-is-half-full summary:
In the big picture, the election results were not terribly surprising. Donald Trump had a lot of good luck in 2016 and a lot of bad luck in 2020. He faced terrible headwinds all year. Also, in 2016, he won by narrowly winning a few key states. In 2020, he lost by narrowly losing in a few key states. The result was not outside the range of reasonable probability