^ Southern whites say that they will remain overwhelming Republican. I wouldn't bet against 'em.
True, but Texas is becoming increasing less "Southern" and more "urban." The counties containing Houston, Dallas, and San Antonio all voting for Obama could represent a new direction for the state. The situation is perhaps similar to the Atlantic Coast where rural white voters are losing their electoral pull and being overpowered by urban and suburban whites who are decidedly more moderate and/or liberal. Plus, the Texas House has shifted dramatically towards the Democrats over the past 6 years and after the most recent election, they're only a few seats away from the majority.