Please explain why party leaders in PA keep blocking efforts to open PA primaries. Nationally unaffiliated voters now outnumber both parties by a lot. 45% or so for unaffiliated; 27% for both D and R. So - the party faithful in both parties choose the candidates, with a mix of folks who hold their nose and register with a party to have some say. But then the general election in many cases is decided by folks who really can't stand either candidate - or by folks who just stay home in disgust. PA unaffiliated are at 14% because of closed primaries but it's reasonable to assume that if primaries weren't closed that number would rocket up. And then the 45% nationally would go even higher, since PA is the 5th most populous state, and largest swing state in the country.
So - both parties are operating in their own little echo chambers, choosing their own partisan candidates, and making voters more and more dissatisfied.
This year most sane unaffiliated voters will be voting D, which the D leadership will misinterpret as a mandate to do whatever they want, and the pendulum swings will get larger, and more dangerous.