Not much of a response. The interview treated Koch influence on politics as a forgone conclusion. (Because it is and Charles didn't seem to argue otherwise).

The point of the interview was to learn about his personal philosophy. Something of which wouldn't be of much interest were it not for his huge amount of influence (that, again, no one is arguing).

As for the final thrust of this response, on how Koch helped stopped a supreme Court nominee, it's likely nothing nefarious. It would be the same as any citizen. Contact your congress people. Difference is, they are going to really listen to the billionaire donating money to their campaign a bit more than your average Joe.