In @CalVoterFdn's latest newsletter, @kimalex3 previews findings from the forthcoming Rejected Ballots report, that CVF and @MindySRomero will release in coming weeks.
On average, since 2010, 1.7 percent of vote-by-mail ballots cast in California have been rejected;
In the three counties studied, young voters comprised the smallest subgroup by age of vote-by-mail voters but the largest subgroup by age of voters whose ballots were rejected;
The top reasons for rejection were lateness, voters forgetting to sign their ballot envelopes, or their signatures not sufficiently matching their voter registration signature; and
In Sacramento, ballots rejected for lateness in three elections studied were late because they were postmarked after Election Day and not because they arrived too late to count.
As @kimalex3 said in the earlier AP story¹, the only thing worse than people not voting is people attempting to vote and having their ballots go uncounted.
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¹ https://apnews.com/a45421048cd89938df7c882891a97db5
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¹ https://apnews.com/a45421048cd89938df7c882891a97db5