The so-called super-PACs or big money political action committees are mostly financed by men. See this Yahoo News article for details.
Frankly, I am not surprised. Decades ago the joke was that the wife got to decide which house to buy and the husband got to decide what political party they'd vote for or whether the family liked the United Nations.
The joke's implication was that she made the important-to-the-family decisions while he decided the airy-fairy esoteric stuff which didn't matter anyway. So men argued about politics, sports, and cars and women discussed what made the best house.
I wasn't so sure this was still true, but perhaps it still is the case when it comes to writing the really big checks.
