BISMARCK, N.D. — Republican state Sen. Tom Campbell says he’s raised more than $1 million for his U.S. Senate campaign, with nearly three-quarters of it coming from himself.

Campbell is one of two Republicans hoping to unseat Democratic Sen. Heidi Heitkamp.

Campaign spokesman Mike Schrimpf says the Grafton potato farmer put $744,000 into his bid, and raised about $276,000 from more than 1,500 donors. Schrimpf declined to say how much cash the campaign had on hand.

Heitkamp’s campaign said Thursday she has raised more than $7.7 million and has about $4.4 million cash on hand.

Former North Dakota Republican Party chairman Gary Emineth announced this week he’ll also seek the GOP nomination.