Someone mathematically explain to me how Sanders can still win California

[pat_k]

14. Yes, except those that have some problem...

...like a mail-in ballot with a missing signature.

As Agnosticsherbet points out the count is slow because there are there are many steps to processing mail-in and provisional ballots. And the whole process has to be properly witnessed. More here.

http://vote.sos.ca.gov/ is one of the better sos sites I've seen. It provides updated totals, counting reporting status, and an unprocessed ballot report. The unprocessed ballot report provides the date/time each county reported in. This helps give a sense of how much the number may increase (e.g., if county last reported on the 8th, the numbers don't include ballots received in the mail on 6/9 and 6/10.