Washington state became the first state in the country to adopt a "top two" primary election system, and now Oregon voters will decide on November 4th whether their state will follow.
Ballot Box reports that Oregon political leaders are opposed to the process, but that Oregon voters are notoriously contrary and just might vote in favor because of that.
In a "top two" primary, voters are allowed to vote for one candidate in any particular race. The top two vote getters, regardless of party, go on to the general election. Therefore, it is possible to have two Democrats or two Republicans running against each other in the general.