Texas has very similar demographics to California, but one reason Texas is red and California is blue is because in California every citizen is able to vote. A federal court has ruled seven times that Texas Republicans drew their congressional districts with racial discriminatory intent, but the federal court in Texas won't have the final say on this. That's where the Supreme Court comes in and they'll have the final say, and that's why Republicans are so desperately wanting to get Kavanaugh confirmed.
The more Justices republicans get to pick, the more those justices gets to protect unlimited campaign spending, and voter suppression laws which helps more republicans get elected.
Seems like a lot of assumptions are being made. You seem to think same demographics equates to the same political views. Vote turnout is not massively different between the states. Frankly, Texas is somewhere in the center compared to how wildly left wing CA is.
Also, democrats seem to benefit from greatly from unlimited spending. Hillary's campaign spent double what Trump had. Democrats outspending republicans is not unusual.
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