In the closed primary system that was being considered when Washington first lost their open primary a voter would of had to declare a party affiliation IF choosing to participate in the primary.

 

Washington voters rejected the closed primary and voted in favor of the top two primary 

 

We had a closed primary for one of our elections and I sat out the primary. (The top two system was temporarily ruled unconstitutional by the 9th Circuit and the US Supreme Court overturned it)

 

When the Republican, Democrat, and libertarian parties sued to end the open primary I think the state's response should have been " fine you guys can hold your own conventions or whatever and figure out your own nomination process"