Republican John Estrada filed his nominating papers at the Fresno County Elections Office Friday.
Rubio was halfway through his four year term when he resigned in late February to take a job with Chevron. The election to fill the State Senate seat will be held May 21, 2013. If there's not a clear winner the runoff will be held in July.
So far, seven candidates are in the running:
Francisco ramirez jr.
And now, john estrada.