I don't like the potential for abuse with the California mail in balloting...

i cal-exited last year and registered/voted in my new state...but i am still registered to vote in Los Angeles! I won't drop off the rolls until i don't vote in 2 consecutive federal elections. So a mail in ballot was sent to my old address twice (i was curious and checked online) -- the Cal primary & the upcoming presidential -- i didn't ask for either and i had always voted in person.

I can see where some enterprising campaigner could organize collecting similar ballots and voting them, especially given the history of corruption in the small unincorporated cities that ring LA City.

Many move out of California each year...

the problem isn't likely significant for statewide offices, but for local ones (city council, school board, state assembly) could be meaningful