Oregon has had exclusively vote-by-mail for over two decades. One of the two major political parties there has opposed it vigorously for all that time, making

Oregon has had exclusively vote-by-mail for over two decades. One of the two major political parties there has opposed it vigorously for all that time, making these claims among others. In all that time, however, it has never offered any evidence that this happens. In fact, when the Oregon Secretary of State audited the 2016 election, they found 54 problematic votes out of 2+ million cast; most of those were someone voting in their old district after they'd moved out of state. A handful (maybe 10 or so?) were double votes. There just isn't any evidence that there are any widespread problems with vote-by-mail, let alone enough problems to affect election outcomes. If there were, I can't believe that the political party in Oregon that opposes it wouldn't have been publicizing such problems over the last 20 years. Besides, it's certainly possible people could attempt to coerce people voting in booths; "take a photo of your vote and show me or we'll get your family" or whatever. The much bigger issue is vote tampering by election officials, which does happen though still not at scale to affect election outcomes. I remember in 2016, the big scandal was a republican clerk in Clackamas county threw out a box of democratic-registered ballots. They were caught, the votes were counted, but that sort of thing is a bigger threat to electoral outcomes than vote-by-mail. It still isn't really a threat; the real threat is voter suppression, which absolutely does happen but which Oregon does a great job at minimizing, with universal vote-by-mail and automatic voter registration at the DMV.