Andy Sanborn, a member of the New Hampshire State Senate, announced his candidacy for New Hampshire’s 1st Congressional District earlier this year. Sanborn faced a challenger in the primary, and would have gone up against the incumbent Democratic Representative, Carol Shea-Porter. That is, until she announced she would not seek re-election in 2018. This makes NH-1 even more vulnerable than it already was. The district was previously rated as R +2 by Cook PVI, and it is one of only 12 Congressional districts Trump won that are occupied by Democrats.

Sanborn is the current favorite for the nomination, having won several endorsements from local politicians, and being the only candidate to have previously held elected office. In his re-election campaign to the State Senate in 2016, Sanborn was endorsed by the New Hampshire Liberty Alliance, the National Rifle Association, the Republican Liberty Caucus of New Hampshire, and the National Federation of Independent Business.