Senator Jon Ossoff, a Democrat, called his Republican opponent, Representative Mike Collins, a bigot. Mr. Collins called the incumbent a radical “trust-fund kid.”

The embattled congressman, accused of throwing scalding water at his ex-wife and breaking his daughter’s collarbone, rebuffed earlier Republican calls to drop out.

© Alex Kent/The New York Times

Senator Susan Collins, one of the most vulnerable Republicans in the midterms, clashed with the Democratic challenger Troy Jackson over President Trump, ICE and more.

© Ryan David Brown for The New York Times

© Kenny Holston/The New York Times

Dr. Annie Andrews, a Democrat, is hoping to defeat Senator Darline Graham. Even some of her most ardent supporters sense that her bid is a long shot.

© Sean Rayford for The New York Times