Maine Sen. Susan Collins concedes to Democrat Troy Jackson

Republican Senator Susan Collins has conceded her race for a sixth term to Democratic challenger Troy Jackson in Maine. Jackson, a former Maine Senate president, became the Democratic nominee in July following a chaotic primary season. Despite the concession, the Associated Press has not yet officially called the race, which Democrats had targeted as a key opportunity to flip a Republican-held seat in a state that has consistently supported Democratic presidential candidates since 1992.