Correct me if I'm misunderstanding, but at least in California this doesn't seem to be the case: https://www.sos.ca.gov/elections/voting-resources/voting-califo

Correct me if I'm misunderstanding, but at least in California this doesn't seem to be the case: https://www.sos.ca.gov/elections/voting-resources/voting-california/if-you-applied/ https://www.sos.ca.gov/elections/voting-resources/voting-cal... It says you should bring in your mail-in ballot to the polling place, and if you don't then you can cast a provisional ballot "which will be counted after your county elections official has confirmed you are registered to vote in that county and did not vote more than once in that election." Based on that wording it sounds like if you already submitted a vote-by-mail ballot, then you would have already voted and your provisional ballot won't be counted.