Troy Jackson, a progressive, solidified his clear edge in the contest to replace Graham Platner, as Shenna Bellows, Jordan Wood and Nirav Shah ended their bids.

In a post on social media, Mr. Vance said his wife and their son, Alec Neel Vance, were “happy and healthy.”

Brent crude, the global benchmark for oil, rose more than 3 percent as trading resumed on Sunday, while S&P 500 futures remained essentially unchanged.