I think it's an interesting topic, it's just a hard one to answer.
Most likely, Celtics, Kings, Suns, and Twolves fans are on our side. Perhaps Milwaukee or Seattle, as you mentioned, and maybe the Blazers, for residual hatred towards the Lakers.
They've got Lakers, New York, and Philly. Maybe Chicago, if they still support Phil.
I think the rest of it is a toss up. We'll pick up a lot of plains states, due to Paul Pierce's playing days at Kansas. Maybe Louisiana for us, because of BBD. The Bay Area could be interesting, because of Powe, and in-state rivalries with the Lakers.