David Schleicher has written this piece for The Atlantic.  A taste: “Elmendorf and I have come up with a few ideas. Ballots could designate which party is in control of the state legislature, allowing voters to more easily decide based on policies and performance. States could mandate that ballots list candidates as, say, ‘Massachusetts Republicans,’ rather than just as ‘Republicans,’allowing voters to more easily disassociate the state and national parties. Voter registration rules could be relaxed to allow separate membership in parties for state and national elections. More radically, states could ban national parties from contesting local elections, allowing local parties to develop, although this would face serious constitutional challenges.”