Former vice president Joe Biden won the primary with 66% of the vote and 46 delegates, while senator Bernie Sanders, who had suspended his campaign a month earlier, received nearly 21% and 15 delegates and senator Elizabeth Warren, also withdrawn, reached almost 10% of the vote.

Two bills had been introduced in the state house in January 2019 that would have shifted the whole primary date to the second Tuesday in March in even-numbered years (which would be tantamount to a primary a week after Super Tuesday), with the first empowering the Oregon secretary of state to shift the date and the second permitting a primary move for the purpose of regional clustering,[1] but neither bill moved beyond committee.

Candidates had to meet a threshold of 15% at the congressional district or statewide level to be considered viable.

The 61 pledged delegates to the 2020 Democratic National Convention were allocated proportionally on the basis of the primary results.

[4][5] Senators Jeff Merkley and Ron Wyden stepped aside as delegation co-chairs in the wake of the George Floyd murder and supported Travis Nelson and Rosa Colquitt as co-chairs.