is there a metropolitan area as politically diverse as the Atlanta area? You can dry a compact 94% Obama district without trying, but you can also draw a compact 75% McCain district in the northern perimeter of the area.
Maybe Dallas or Houston.
I would agree with Houston. In 1984, there was a district that took in the area inside the 610 loop called the 18th District that gave Walter Mondale 72 percent of the vote. There was also a district right next to it that took in the the memorial villages, river oaks, and the remaining western part of the county called the 7th which gave Reagan 83 percent of the vote.