Former Assemblywoman Sarah Reyes won't be running for Shafter state Senator Dean Florez's seat in 2010, said a spokesman for the California Endowment Thursday.

With Reyes' boss, Assemblyman Juan Arambula, stating he won't run either, that seems to leave the Democratic field open for Kern County Supervisor Michael Rubio. No Republican challenger has materialized for the race as of yet.

Jeff Okey of the Endowment said Reyes will lead the efforts of the group to serve communities of Arvin and Lamont, Merced city and county and Fresno.

"She's made a long-term committment to us," Okey said.

Reyes couldn't be immediately reached for comment. Her statement in a press release:

“I am pleased to join The Endowment as it launches its new strategic plan. In my new role, I will continue to represent the interests of the Central Valley.  I am excited about working long term within philanthropy to affect positive change.  I look forward to the years ahead leading The Endowment's efforts in the Central Valley, building upon our region’s rich and diverse assets.”

The Endowment is "a private, statewide health foundation, was established in 1996 to expand access to affordable, quality health care for underserved individuals." according to the release.

Rubio said he's still focused on doing what it takes to win a contest for the seat.

“It’s a year away so I’m sure some candidates will develop. But we’re going to work hard raising money because we want to represent the valley,” he said.