Emken unsuccessfully took on incumbent Democratic Sen. Dianne Feinstein in 2012, losing by a wide margin. The Republican's statement of candidacy, filed with the Federal Election Commission last week, lists Bera's seat in California's 7th Congressional District.
While Emken has not formally launched her candidacy, spokesman Mark Standriff told Capitol Alert that "she's in it."
"She's committed to run," Standriff said.
Former congressman Doug Ose, who departed the House of Representatives in 2005 and is considered a top Republican contender for Bera's seat, told Capitol Alert that he is still mulling the possibility of a run. He said Emken has contacted him to seek an endorsement, which he declined.
"I'm in the process of figuring out, is there a path to victory? If there's a path to victory, it'll be obvious what I'm going to do," Ose said.
PHOTO: U.S. Senate candidate and autism activist Elizabeth Emken at her Danville home on April 18, 2012. The Sacramento Bee/Manny Crisostomo.