I go a step farther. In my state, there is no requirement to join a party to vote in the primaries. Instead, you simply pick a party for which to vote. I believe the only rational choice is to say "Give me one ballot for each party," which gives close-to-stacked-rank voting for the primary.

I still show up for the primaries, as I want the chance to choose who I vote for when I get to the general election. However, such a system makes it impossible for me to consider political office (beyond school board) as my primary declaration is a matter of public record, meaning that I would not pass any test of party purity.

What I really want is stacked-rank voting in the primaries and in the general election. I think it would be interesting to see how the general public, used to a Coke vs Pepsi choice, handle a spectrum of choices where you don't have to Pick Only One.