NPR tells me that there are 1 million people in Maryland who won't be able to vote in the primaries tomorrow. They are not registered...aka Independents. In MD, you have to be a party member to vote in that party's primary.
Apparently, there are some states where Independents can vote in a party primary.
My question: Why?
It seems to me you need to be part of the group to have a say in how the group operates. Synagogues don't let non-Jews vote for board members. Churches don't let atheists vote.
What's up with the idea?