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I believe California has been doing vote by mail prior to this election. As well as for other Dem states.

I believe you are, exactly as they intended, confounding mail in ballots, where an actual voter has to request a ballot, with vote by mail, where they mass mail ballots to everyone who has ever been on the never-purged voter roles, alive, dead, or moved.

Any number of ballots sent to nonexistent voters can be harvested from the trash cans at high turnover large apartment complexes and submitted.

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...the trashcans by the mailboxes...