Democrats CAN capture Texas.

[Person Man]

Who says that the Whites will remain overwhelming Republican... Obama carried the White vote in Colorado.

[Person Man]

^ 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.

Bingo!

[Person Man]

...if anything, Texas could simply remain republican in even elections out of the need for the Republican Party to maintain its status as a viable opposition party with a chance of reforming their government in the decades to come.