As of a few years ago the Kochs had given 200,000 to Democrats—including Chuckie Schumer. The total is likely higher now. Perhaps they had so much cash sitting around, they ran out of Republicans to give it to?
The Kochs are social liberals. Not my cup of tea. More Trumps along those lines but they part ways on the open border thing. I will give you that while noting that Trumps dissing of Romney’s self deportation plan just 8 years ago was consistent with the Kochs.