But this is just wrong. There are lots of one-percenters who vote Democratic. They just mostly feel more strongly about cultural-liberalism issues than they do about economic ones. But when it comes to economic issues, these folks still tend to lean rightward; they overestimate the degree of social mobility the economy makes possible today, they support "ownership society" initiatives like 401(K)s and health vouchers over social insurance programs, and so forth. These folks aren't found just in tech, they're also quite common in the entertainment industry and other "new economy"/"information economy" sectors. (The derogatory term for them used to be "limousine liberals"; rich people who were totally down with helping the poor, as long as doing so didn't cut into their personal bottom line.)
So you have billionaires on both sides. American politics, in fact, has mostly become a battle between billionaires. On one side you have billionaires who care about social liberalism, on the other you have billionaires who care about economic liberalism. But they're all billionaires, so issues that don't affect billionaires personally (like the minimum wage, or how to pay for retirement, or the unemployment rate, or affordable housing) just don't get included in the debate. As far as the political system is concerned, they're non-issues. They don't exist.
There used to be institutions that brought these issues into the discussion anyway, like political parties and labor unions. But those have mostly atrophied over the last 50 years, so we have a system where whether the capital gains tax rate is low enough (a question that billionaires of all stripes care deeply about) is continuously and loudly debated, while whether the minimum wage is high enough is hardly ever discussed.