California Lt. Gov. Gavin Newsom Not Running for Boxer's Seat

Newsom bows out of an already-competitive race for U.S. Senate seat in 2016.

California's Lt. Gov. Gavin Newsom won't be running for Senate in 2016.

In a Facebook announcement Monday, Newsom said that while he is "humbled by the widespread encouragement of so many," his head and his heart "remain firmly in the state of California...not Washington D.C."

"It's always better to be candid than coy," Newsom said in his announcement. "In the months to come, I look forward to doing whatever I can to help elect California's next great Democratic Senator --- one worthy of succeeding Barbara Boxer and serving this remarkable state of dreamers and doers in the United States Senate," Newsom said.

Newsom was often cited alongside several other Democrats who might be considering a run for the seat.

Sen. Barbara Boxer's retirement last week set off of a flurry of speculation as prominent Democrats in the state positioned themselves for what is sure to be one of the most expensive and competitive Senate races of 2016. Boxer's exit marks the first time one of the California Senate seats have been open in more than two decades.

Other candidates that may make a run include California Attorney General Kamala Harris, former Los Angeles Mayor Antonio Villaraigosa, environmentalist and Democratic donor Tom Steyer, and a handful of representatives including Loretta Sanchez and Jackie Speier.