Biden losing momentum by playing prevent defense

For the entirety of the 2020 campaign, President Trump’s team has barked that the polling is wrong, over-represents Democrats, under-represents Republicans, doesn’t properly account for Trump partisans refusing to play along, misses the intensity of voters, or whatever.

As I have noted before, all of that may be right, but it is immaterial.

What is material is that the presidential race has been static for the last four or so months, and that is bad news for presumptive Democratic nominee Joseph R. Biden.

Let’s assume the survey results are, broadly...