U.S. Rep. Joe Kennedy III speaks outside his campaign headquarters in Watertown, Mass., after conceding defeat to incumbent U.S. Sen. Edward Markey, Tuesday, Sept. 1, 2020, in the Massachusetts Democratic Senate primary. (AP Photo/Charles Krupa)

Congressman Richard Neal celebrates his victory in the Democratic primary over challenger, Holyoke Mayor Alex Morse, Tuesday, Sept. 1, 2020, in Springfield, Mass. (Don Treeger/The Republican via AP)

Incumbent U.S. Sen. Edward Markey celebrates with wife Susan, left, in Malden, Mass., after defeating U.S. Rep. Joe Kennedy III, Tuesday, Sept. 1, 2020, in the Massachusetts Democratic Senate primary. (AP Photo/Michael Dwyer)

Holyoke Mayor Alex B. Morse speaks at Jay's Bed and Breakfast after his loss to U.S. Rep. Richard E. Neal in the Democratic primary for the First Congressional District, Tuesday, Sept. 1, 2020, in Holyoke, Mass. (Hoang "Leon" Nguyen/The Republican via AP)