加州的规定 https://www.sos.ca.gov/elections/voting-resources/voting-california/if-you-applied/ Even if you receive your vote-by-mail ballot, you can change your mind and vote at a polling place on Election Day. To do so, you can: Mark your ballot and seal it inside the mailing envelope provided by your county elections official. Be sure to sign and date the outside of the envelope in the space provided. Then bring the sealed envelope to any polling place in your county, or to your county elections office between 7:00 a.m. and 8:00 p.m. on Election Day. OR Bring your unused vote-by-mail ballot to your local polling place anytime between 7:00 a.m. and 8:00 p.m. on Election Day and give it to a poll worker, who will exchange it for a polling place ballot you can use instead.
为了防止一人投两票，已经收到邮寄选票的在11／3投票日就算本人去了投票站，也不会被允许在机器上投票的。
实际上只要选举OFFICE的记录上是寄给你选票了，不管你收到没有，就不能在选票机器上投了。
你可以本人去把你的邮寄选票送到投票站，那应该会被count。
但如果记录上选票邮寄给你了，而你去投票站的时候手里没有拿你的邮寄选票，那你只能投 PROVISIONAL BALLOT。
就是当场手填一份类似邮寄选票的东西,过程很麻烦. 然后等ELECTION OFFICE 日后确认没有收到你的邮寄选票之后,你 这张provisional ballot才会被count. 通常要过好几天, 如果选票结果不接近的时候,很有可能就不count了.
大选来说- 如果得票结果没有理论上追上来的可能了，才会call.
但是所有票都最终会被count, 因为还有local各种election呢，这个过程可能持续很久。有些小官得票也就赢个几百几千的，必须所有都count.
各州规定不一样。楼主你可以标明你自己所在州。但是请不要误导别人。
加州的规定 https://www.sos.ca.gov/elections/voting-resources/voting-california/if-you-applied/
Even if you receive your vote-by-mail ballot, you can change your mind and vote at a polling place on Election Day. To do so, you can: Mark your ballot and seal it inside the mailing envelope provided by your county elections official. Be sure to sign and date the outside of the envelope in the space provided. Then bring the sealed envelope to any polling place in your county, or to your county elections office between 7:00 a.m. and 8:00 p.m. on Election Day. OR Bring your unused vote-by-mail ballot to your local polling place anytime between 7:00 a.m. and 8:00 p.m. on Election Day and give it to a poll worker, who will exchange it for a polling place ballot you can use instead.