Another way of looking at it is to assume that primaries are effectively "open" if the only restriction is that members of a party must pull their primary's ballot, and then compare those to states where unaffiliated voters are restricted in some way (or not permitted to vote at all). Obviously a few notable states (like NC) stick out in this comparison, but it does simplify the analysis.
Red states are where you absolutely have to be registered with that party in order to vote in its primary; yellow states have exceptions (listed below) and green states are either entirely open or only restrict party members from voting in other parties' primaries (AK is a unique partial exception):
That's really helpful, yeah! Thanks.
So, basically, the results in green states, as well as Alaska, can be taken as some indication for voting patterns going forward (although obviously some are still skewed by the lack of competitive primaries). The ones with "+" (including, apparently, NJ) can be taken as a very rough indication, and the other yellow ones and the red ones can be disregarded entirely.
I'm shocked about WV, given that the primary map still looks like something out of the 1960s.
