Dutton, who is running against GOP Rep. Gary Miller in the Inland Empire district, announced this week that he has been endorsed by state Superintendent of Public Instruction Tom Torlakson.
Torlakson, a former Democratic legislator from Antioch, called Dutton a "true citizen representative who has proven time and again that he fights for his constituents and is effective in representing their issues" in a statement released by the campaign. Both cited time spent working together in the state Legislature.
"I take pride in the fact that throughout my career I have been able to work with members of both parties to represent every member of my district," Dutton said in the statement.
The 31st Congressional District is one of more than two dozen races across the state that will feature only two candidates of the same party in November as a result of the state's new top-two primary system.
The Dutton vs. Miller runoff isn't the only same-party runoff where candidates are reaching across the aisle for endorsements. Democratic Rep. Howard Berman and Democratic Rep. Brad Sherman have both picked up endorsements from Republicans in the 30th Congressional District fight.
Editor's note: This post was updated at 2:22 p.m. to reflect endorsements received by Brad Sherman.
PHOTO CREDIT: Sen. Bob Dutton of Rancho Cucamonga, comes to the Capitol Bureau to discuss the minority's party's role in solving the state budget deficit on Wednesday, Feb. 16, 2011. Hector Amezcua, Sacramento Bee.