Texas has feet of clay precisely because of the urban areas of Houston and Dallas. It will be almost impossible to destroy the liberal power bases in those cities-they will only grow stronger with time. Any state that hosts a city with a population exceeding 250,000 is going to be pulled to the left.
Check the growth of cities to stop liberalism. If they don't control your state legislature yet, zone them in good and tight. Control development near the cities to prevent the growth of liberal "exurbs." I'm not joking. States like Texas, Arizona and North Carolina need to take steps ASAP to keep from becoming another Virginia or Florida.
Wise advice, unfortunately I doubt it will be taken.
I believe Harris county was 50/50 Obama/Romney. That is amazing for a major metropolitan area.