Some Democratic Senators are backing Lt. Gov. Lee Fisher for the Senate even though he is in a contested primary with Secretary of State Jennifer Brunner.

At least four Democratic Senators in recent weeks have contributed to Fisher’s campaign from their leadership political action committees, according to campaign documents recently filed with the Federal Election Commission.

Fisher backers in the Senate include Mark Warner (Va.), whose Forward Together PAC gave $5,000 on Dec. 16; Debbie Stabenow (Mich.), whose America’s Leadership PAC donated $5,000 on Dec. 17; Frank Lautenberg (N.J.), whose New Jersey First PAC gave $2,500 on Dec. 18; and Mark Udall (Colo.), whose PEAK PAC gave $2,000 on Dec. 29.

The Democratic Senatorial Campaign Committee hasn’t formally endorsed a candidate but has spent some limited “coordinated expenditures— to assist Fisher, who raised more than four times as much money as Brunner through the end of September and had $1.6 million in cash on hand compared with Brunner’s $112,000.

DSCC Chairman Bob Menendez (N.J.) last November noted Brunner’s difficulty in raising campaign funds.

Fisher or Brunner will face the winner of a Republican primary between former Rep. Rob Portman and car dealer Tom Ganley. GOP Senators prefer Portman.