The Bulletin, daily newspaper for Bend, Oregon, has this editorial about HB 3500. Oregon has already switched to a system of automatic registration for individuals with a drivers license or a state ID card. HB 3500 provided that those new voters would automatically receive in the postal mail a primary ballot for the Republican, Democratic, and Independent Parties. That way, these new voters would easily choose to affiliate with one of those three parties, the only three parties in Oregon entitled to a primary (the other qualified parties nominate by convention).
The editorial says HB 3500 is not fair to the qualified parties that nominate by convention. The bill has been converted into a proposal to study this issue.