Now that that is out of the way:
-Texan voter turnout is well bellow the national average for Presidential, off year, and Primary elections. In 2012: 53.6% turned out nationally v. only 43.7% in Texas. Over the last four decades Texas has a voter turnout of of 47.6% in 1992. The high turnout of Texas is still lower than the national low of 49.1% (in presidential years only) in 1996.
-Texas has a rapidly growing Hispanic population. Non-Hispanic whites are now represent a minority in comparison to all other races put together. As of 2011. Hispanics represented 38.1% of the state's population.
-The key to Democrats winning back Texas will be:
1. Wait out the demographic shit until Hispanics represent an even larger portion of the electorate.
2. Expand the lead over Republicans in Hispanic voting to match national levels.
3. Turn out Hispanic voters in much larger numbers.
4. Expand voter turnout overall.
Julian Castro, at the moment, represents the Democrats best chance of turning Texas blue over the next decade.