COLLINS V. JACKSON： Watch MS NOW's coverage of the Maine Senate race SHAKE-UP ｜ COMPILATION

Troy Jackson, a fifth-generation logger and former state Senate president, has won the Democratic nomination for the U.S. Senate in Maine. He is challenging Republican incumbent Susan Collins in a high-stakes race that serves as a key indicator for Senate control. The contest pits Jackson's working-class populism against Collins' established political incumbency.