I'm sure it is an outlier, but I will also say this. Obama has a ground game here in Texas. I think the idea is to work and get a grass roots network to help downticket items as well as get an established network for 08 and 12. I don't believe there is a serious McCain ground game here. When you realize how many people were registered for the Democratic primary there is some momentum to be had.
All in All, I expect McCain to carry this state and to carry it easily, but I think there is a small chance with a motivated ground game to turn it blue. Now, that chance is really small and even if it does go blue its likely only because Obama is winning in a landslide. I don't think Texas EVs are going to come into play as a tipping point. If Texas goes blue, its because Obama is well past 270 EVs.