Feigning outrage that college is too expensive is a bipartisan pastime, so it’s refreshing to see a presidential candidate taking the cost-drivers seriously. Senator Marco Rubio is highlighting an obscure network of higher-ed busybodies known as accreditation agencies, and more politicians should study up on how to reform this racket.

“Our higher education system is controlled by what amounts to a cartel of existing colleges and universities, which use their power over the accreditation process to block innovative, low-cost...