Bernie Sanders significantly outraised his Democratic presidential rivals in the final three months of 2019. He is very much in the hunt for the first three contests of the primary season. He has run second, behind Joe Biden, in national polls for most of the past year and matches up better head-to-head against President Trump than either Elizabeth Warren or Pete Buttigieg. When Sanders supporters complain that the political press isn’t giving their guy the attention he deserves, they have a point.

Odds are that the Vermont...