"State and federal laws prohibit non-citizens from voting in national and local elections.
The mistake occurred in part because Oregon has allowed non-citizens to obtain driver’s licenses since 2019, and the DMV automatically registers most people to vote when they obtain a license or ID, Glenn said."
Around 100 a year…
Looking at the 2022 elections, none of them would have been decided by 300 votes.
https://sos.oregon.gov/elections/Pages/electionhistory.aspx
Governor:
Kotek (D) - 917,074
Drazan ® - 850,347
Johnson (Non-Affiliated) - 168,431
Smith (Constitution) - 8,051
Noble (Libertarian) - 6,867
“Misc.” - 2,113
Senate:
Wyden (D) - 1,076,424
Perkins ® - 788,991
Henry (Progressive) - 36,883
Pulju (Pacific Green) - 23,454
“Misc” - 2,197
OR1:
Bonamici (D) - 210,682
Mann ® - 99,042
“Misc” - 519
OR2:
Bentz ® - 208,369
Yetter (D) - 99,882
“Misc” - 425
OR3:
Blumenauer (D) - 212,119
Harbour ® - 79,766
Delk (Progressive) - 10,982
“Misc” - 467
OR4:
Hoyle (D) - 171,372
Skarlatos ® - 146,055
Leatherberry (I) - 9,052
Howard (Constitution) - 6,075
Beilstein (Pacific Green) - 6,033
“Misc.” - 490
OR5:
Chavez-DeRemer ® - 178,813 McLeod-Skinner (D) - 171,514
Misc. - 906
OR6:
Salinas (D) - 147,156
Erickson ® - 139,946
McFarland (Constitution) - 6,762
“Misc” - 513