One of Senate Minority Leader Chuck Schumer’s (D-NY) top midterm recruits is fighting to prove she is still a viable Senate candidate in Maine as her primary challenger, oyster farmer Graham Platner, maintains a commanding lead — in both polling and fundraising — despite his political baggage.

Gov. Janet Mills (D-ME), a two-term governor with a centrist reputation, is on paper the sort of challenger national Democrats believe is necessary to unseat Sen. Susan Collins (R-ME), a five-term senator and the only Republican to hold statewide office in light-blue Maine.