ROLLA, N.D. (AP) — State Rep. Marvin Nelson is ready to launch a campaign for governor of North Dakota.

Nelson says he will formally announce on Wednesday that he'll seek the Democratic nomination. The party so far has no declared candidate.

The 57-year-old Nelson, of Rolla, has been a House member since 2011. He is an agricultural consultant and represents a district in northern North Dakota that includes the Turtle Mountain Indian Reservation.

Republican Gov. Jack Dalrymple announced in August that he wouldn't seek re-election.

Three Republicans are running for the seat: Attorney General Wayne Stenehjem, Bismarck state Rep. Rick Becker and Fargo businessman Doug Burgum.