Ruy Teixeira has a post at Think Progress that is encouraging if you're a Democrat. He discusses what it will take to turn Texas blue, even though the white vote in Texas remains overwhelmingly Republican. Please read the whole thing, but here's a sample:
[T]he quest for a blue Texas is going to have to be built on three pillars, only one of which is ongoing demographic change. The other two are matching minority, particularly Hispanic, turnout to white turnout and elevating white support for Democrats. In the latter area, if the Democrats can simply get their support to the 30 percent level — in other words, make the typical landslide among whites for the GOP just a little bit less of a landslide — they will be in a good position to stand on all three pillars and make their dream (and Greg Abbott’s nightmare) of a blue Texas come true.
Of course, of those three pillars, Rick Perry would only be able to remember two of them... maybe... on a good day.