Maine Senate candidate Graham Platner’s latest controversies could upend the battle for Senate control in the 2026 midterm elections, as his candidacy could complicate Democrats’ path to flipping the chamber if he stays in the race.Midterms are typically viewed as a referendum on the party in the White House, and the president’s party historically loses seats—particularly when he is unpopular. Despite facing a challenging Senate map, Democrats are optimistic about their chances of flipping the chamber amid President Donald Trump’s declining national approval rating. Republicans currently hold a 53-47 majority, so Democrats must flip four seats to gain control.The Senate...