FILE - In this Nov. 6, 2018, file photo, Democrat Chris Pappas celebrates winning New Hampshire's 1st Congressional District race in Manchester, N.H. Pappas is the incumbent Democrat candidate in New Hampshire's Sept. 8, 2020 primary election. (AP Photo/ Cheryl Senter, File)

This undated photo provided by his campaign shows Matt Mayberry, a Republican candidate in the 1st Congressional District in New Hampshire's Sept. 8, primary election. (Kevin Abbott/Mayberry for Congress via AP)

Matt Mowers speaks before a campaign rally for President Donald Trump at Manchester-Boston Regional Airport, Friday, Aug. 28, 2020, in Londonderry, N.H. Mowers is a Republican candidate in the 1st Congressional District in New Hampshire's Sept. 8, primary election. (AP Photo/Charles Krupa)