I strongly disagree with your contention that the majority of the tech-world is left-leaning in their politics. I have met many libertarians and conservative tech-workers in my almost eighteen years working in development.
Moving from Madison, Wisconsin, to here was a bit of a shock. There are nerds around here whose geeky obsession is church. When I vote, many of the offices are simply uncontested, with just the (R) candidate appearing on the ballot. And even the Democratic candidates--when they even appear--may be more conservative than Republicans from more liberal regions.
Of course, as a libertarian myself, I don't feel much more disenfranchised now than I felt when I was surrounded by hippy-dippy liberals.
Maybe the majority of tech people who live in hipster towns?