Politicians and officials in Mexico are using the country’s laws to intimidate critics and the media, forcing them into censorship and blunting scrutiny.

Charismatic, northern and exuding a relaxed optimism, Mr. Burnham is a contrast to Keir Starmer. His allies hope he could mend Labour’s relationship with voters.

Mr. Dunlap, a progressive Democrat, is set to face former Gov. Paul LePage, a Republican, in a competitive general election in November.