the tweets yesterday may mislead people into thinking they don’t need to register to get a ballot (only registered voters receive ballots).
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In California you don’t need to register. Just hang around and pick up the undeliverable ballots left unattended.
Look at any vacant property and see if there are one or more in the mailbox. Check apartment building and gather what is left on the floor as undeliverable.
That there is some bona fide ballot harvesting.