For years, I've wondered why Washington's pick-a-party primary was constantly referred to as "Montana-style," rather than "Idaho-style." Idaho's closer, after all, and both have open primaries in which a person is free to pick the party whose primary they wish to vote in. That's what Washington has had recently, although a recent Supreme Court ruling means that August's primary will likely look a lot like the old vote-for-whoever-you-want blanket primary.
But maybe Washington's lawmakers and election officials were just prescient. Reports the Assocated Press:
The Idaho Republican Party is suing the state in federal court, hoping to force the closure of Republican primary elections to anyone who is not a registered Republican.