Surprised about Tarrant County, inasmuch as it was the home of Brother Jim Wright.
From what I remember about the red and blue county voting map from 2008, it was the largest metropolitan county that went for McCain, and by a large margin. I think Oklahoma County (OKC) and Orlando were also heavily Repubican.
Tarrant County is not as "urban" as folks might think even though it contains both Fort Worth and Arlington. And while Jim Wright successfully pork-barrelled a lot of projects to and around then General Dynamic (now Lockheed Martin), he by and large campaigned in Fort Worth as a fiscally conservative democrat (even though he legislated as a screaming liberal). When he lost his seat, it was held initially by Pete Geren, who by democrat standards was extremely conservative, but has since been held by Republican Kay Grainger who is a fairly reliable conservative rep. Tarrant County is largely suburban rather than urban.