#1 seems like the best option to me. It doesn't seem like there's any point to have "Here's my map of state x" threads that generate two or three replies.
I agree that one location for maps generated with Dave's App makes sense. That's probably what should be done for discussion of all the Swing State Project maps as well - create a single thread. For other sources unique to a state, a state-specific thread makes sense. That will also be true as states change or consider changes to their redistricting process.
