Given that the gentleman is black, there was a 95% chance that he was a dim, thus there should be little interest in the fact that he is following the party line.
In Texas, mayors are all elected on nonpartisan ballots in off years. If a mayor is a "Democrat," such is his statement of allegiance, but not a ballot phenomenon. There are more Democrats in TX than many of us seem to think, and they expect to return to the majority in 2006.