I mailed my absentee ballot on Monday, October 20th.
Since mailing it in, I've received only one piece of mail re: who/what to vote for, plus one phone call that left a message about supporting one of the ballot measures. There was also a group of people on a corner one evening waving signs about supporting that same proposition. I expect more mail will be coming in soon. All too late for my attention.
This is the third election where most of the mail I've received has arrived after I mailed an absentee ballot. Given the high number of absentee ballots cast in California, I think candidates/parties/supporters need to rethink their mailing strategies.