Per Scott Lay from the Nooner just now:
State Senator Bill Emmerson announced late this afternoon that he intends to resign his seat mid-term on December 1, 2013. I watched Emmerson speak on a panel with Senate President Pro Tem Darrell Steinberg at the California Economic Summit hours earlier, and he gave no indications of the impending announcement.
After the vacancy created on December 1, the governor will have 14 days to call an election to fill the vacancy. I think we’re likely looking at a primary election on April 1 with a runoff consolidated with the June 3 statewide primary election.
Tim Donnelly likely can file for both the gubernatorial race and the Senate special election, if he so chooses. Assemblymember Mike Morrell is the other member nested in the district.