Republicans are nearing endangered species status in California. According to a new report by the Secretary of State, the number of California voters registered as Republicans is now at 28 percent. Democrats are holding steady at 43 percent. But an increasing number of people are now registering as “decline to state.” That number seems to be driven by young Californians who increasingly don’t identify with either the Democratic or Republican parties. What’s driving the trend, and how is it playing out in this year’s presidential race?