Tea party-backed businessman and former Maine state Treasurer Bruce Poliquin defeated state Sen. Emily Cain (D-Maine) in the state's 2nd District Tuesday.
Poliquin defeated former state Senate President Kevin Raye, a former chief of staff to Sen. Olympia Snowe (R-Maine), in the Republican primary earlier this year.
Cain received support in her race from Emily's List, a group which works to elect Democratic women who support abortion rights.
The seat became open when Rep. Mike Michaud (D-Maine) decided to challenge Gov. Paul LePage (R).