Neither St. Louis nor Baltimore were able to hold onto the teams they once had. Besides, there really is no need to have a team in both D.C. and Baltimore.
If the Clippers decide being the #3 team in Southern California is not what they want, then a move to Seattle requires the least mucking around with the divisions.
However, having said that, it would be interesting to have Clippers move to Baltimore.
What about a team in Cincinnati? You've already got the Bengals and Reds.
Well, I'm not from Cincy (tho I love WKRP, especially this time of year) However I'd rather see a reincarnated Kentucky Colonels than a reincarnated Cincinnati Royals precisely because Cincy has other major league teams while Louisville does not.