The messy, Democrat-on-Democrat fight over New York’s congressional map, explained

2022 was already shaping up to be a really tough year for Democrats as they contend with President Joe Biden’s unpopularity, inflation, and historically bad odds for the party of the incumbent president in the midterms. The last thing they needed was a big internal fight to overshadow what looked like one of their bright spots this year.

But that’s what they are getting in New York.

On Friday, a state court is expected to finalize new congressional maps that, if adopted without changes from the draft version released earlier this week,...