This past decade, it would have been a 4D/3R/1T map. Given how far left MD-06 and the outer DC suburbs in general moved last cycle, there probably isn't enough there to make a 3rd R district anymore, so it would probably be 5D/2R/1T. MD still has a huge Republican geographical advantage.
It would take a Republican gerrymander to draw a 4D/3R/1T map.
Not really, I can do a map that like that with rectangular districts and 2008 numbers. The tossup seat would be Lean D by 2016, though and the 3rd R district would be close to flipping now.