North Dakota’s lone congressman, Republican U.S. Rep. Kelly Armstrong, easily won election as North Dakota’s next governor, continuing the GOP’s three-decade grip on the highest job in the conservative state.

Armstrong beat Democratic state Sen. Merrill Piepkorn and independent candidate Michael Coachman for the post by receiving 68.3% of the vote.

Armstrong will be sworn in on Dec. 15, weeks before the biennial Legislature convenes with an expected Republican supermajority in Bismarck.

He will succeed outgoing GOP Gov. Doug Burgum, who did not seek a third term.

Republicans have held the governor’s office since 1992.