The last time I was in Texas (for a convention for about a week), I was pulled over twice while driving and the cops arrested around 5 people from the convention including the organizer. I swore, I'd never visit that state again. But, I may make an exception for Austin for SWSX.
That being said, not sure this case is about Race. The guy does look a little impaired in the parts of the video I saw. Would need to see the whole video to be sure. Also, the news report showed them doing something similar to a Caucasian. The arrests may still be disproportionally targeted toward African Americans, but would have to see the stats to determine that. Or, it may just be an overzealous police policy to crack down on drunk driving.