Texans appear to feel strongly about this topic.
It's an anti-gay marriage amendment. I guess this proves that even big cities in Texas (excluding Austin) are very conservative.
It's not just Texas. Take a look at the map of the 2004 gay marriage amendment in Ohio:
That red county is Athens, which contains Ohio University, and is decidedly liberal and has a relatively smaller population.
Although Cleveland, Columbus, Cincinnati, Toledo, Akron and Dayton might have voted for the amendment by smaller margins than the rural areas, they still did so nonetheless.
Oh Athens. Probably the most reliable Democratic County in Ohio strangely enough. I am fairly surprised by the Franklin County results though since Columbus is supposedly so gay friendly. I guess the suburbs overpowerd the city vote.