High Number Of Mail-In And Absentee Primary Ballots Rejected : NPR
https://www.npr.org/2020/08/22/904693468/more-than-550-000-primary-absentee-ballots-rejected-in-2020-far-outpacing-2016
Newsom: California could permanently mail ballots to all voters
https://www.politico.com/states/california/story/2020/11/03/newsom-california-could-permanently-mail-ballots-to-all-voters-1333404
The Hidden Mess That Could Cost Democrats Up to Two Points in November | The Cook Political Report
https://cookpolitical.com/analysis/national/national-politics/hidden-mess-could-cost-democrats-two-points-november