Democrats concede this N.J. congressman could be in trouble. Is it a warning sign for Biden midterm?

Rep. Josh Gottheimer is the latest addition to the Democrats’ list of House members who could face tough re-election campaigns as polls show Republicans with an edge in this fall’s midterm elections.

Gottheimer, D-5th Dist., became the fourth New Jersey Democratic representative – more than any other state — on the Democratic Congressional Campaign Committee’s “Frontline” program, which provides extra help for incumbents expected to be in tight races.

“This is in large part a reaction to the gubernatorial election and closer-than-expected result there,” said Jacob Rubaskin, an analyst with Inside Elections, which...