National conservatives have officially set their target on a rare contested primary for North Dakota’s open House seat.

The Club for Growth endorsed Public Service Commissioner Kevin Cramer today, just one day after FreedomWorks announced its support for his bid.

The North Dakota Republican Party and its leaders support Public Service Commissioner Brian Kalk, who received the party’s official endorsement at the state convention earlier this year. Cramer opted to run outside the convention system — an infrequent move in North Dakota — and challenge Kalk in the June 12 primary.

The state GOP’s support gives Kalk financial and political resources, and now national groups could boost Cramer with their own deep pockets and fundraising network.

“Kevin Cramer will fight to cut spending, repeal ObamaCare and restore fiscal sanity in Washington,” club President Chris Chocola said in a statement.