The Texas Tribune reports that the presidential vote in Fort Worth mirrors the presidential vote across the state more than any other metropolitan area. In fact, Fort Worth was the only one of the largest metropolitan areas in the state to vote for Romney.
One reason is that Fort Worth is less racially diverse than other urban areas. 538 points out however that despite the hopes of Democrats that a larger Hispanic population would make them more competitive in the state, low voter turnout by Hispanics has reduced their competitiveness. The story contains great graphics. This one shows where people live in the state: