This article is a fascinating read, if deeply disturbing.
They are overwhelmingly white, rich, older and male, in a nation that is being remade by the young, by women, and by black and brown voters. Across a sprawling country, they reside in an archipelago of wealth, exclusive neighborhoods dotting a handful of cities and towns. And in an economy that has minted billionaires in a dizzying array of industries, most made their fortunes in just two: finance and energy.
Now they are deploying their vast wealth in the political arena, providing almost half of all the seed money raised to support Democratic and Republican presidential candidates. Just 158 families, along with companies they own or control, contributed $176 million in the first phase of the campaign, according to a New York Times investigation. Not since before Watergate have so few people and businesses provided so much early money in a campaign, most of it through channels legalized by the Supreme Court’s Citizens United decision five years ago....
Oh, and, unsurprisingly, there's this:
[All images are from the linked article]