Nearly 150,000 mail ballots rejected in California' primary despite efforts to count every vote

Nearly 150,000 mail-in ballots (about 1.73%) were rejected in California’s June primary — a noticeable rise from recent primaries — with roughly 93,000 voided for being postmarked or arriving too late.
Officials and voting experts suspect changes in USPS processing and lots of last-minute voting slowed postmarks, prompting repeated pleas for voters to mail ballots earlier.
Signature problems also knocked out many ballots (about 44,000), and some counties — notably Tulare — had much higher rejection rates than others.