Tom Steyer and Katie Porter prepare to debate. Photo: Jason Henry/Getty Images Much of the strategic buzz over the strangely low-profile yet high-stakes California gubernatorial race has revolved around two issues. First, there’s the fear among Democrats that, owing to their crowded field and the state’s nonpartisan top-two primary system, there could be a “Republican lock-out.” If Steve Hilton and Chad Bianco finish first and second in the June 2 primary, the heavily Democratic state will be