An uber-complex presidential primary

A new poll of California voters finds a virtual tie among Sens. Bernie Sanders and Elizabeth Warren and former Vice President Joe Biden just a couple of weeks before mail voting begins for the March 3 Democratic presidential primary.
Sanders crept ahead of long-time leader Biden among Democratic voters in the Public Policy Institute of California poll, jumping 10 percentage points over the last two months to 27%.
Biden’s and Warren’s shares were unchanged at 24% and 23% respecti