“Politics is about the free competition of ideas,” says the man wielding $20 million worth of Koch Brothers funding and the commencement speech microphone. Money talks, and it speaks loudly at Claremont McKenna College. It speaks at the Athenaeum, it speaks through a professor’s voice, it speaks over the loudspeaker at the $70 million Roberts Sports Pavilion. It purses its lips when students ask about mental health resources or a more diverse faculty. People surprised about the Arthur Brooks...