Calls for diversity in higher education have been ongoing for, at least, a century. Today, the diversity movement in higher education is in danger of being co-opted in the US by a move to make 'intellectual diversity,' i.e. the diversity of political opinion, on par with the cultural and historical diversity that one finds within differently racialized populations. Intellectual diversity is thought to track different modes of thinking between conservatives and progressives that need policy interventions to promote and protect. Here I offer an account of a mode of thinking to probe what conservative, libertarian, progressive, and critical theory orientations, as modes of thinking, should show in order to present themselves as tokens of 'intellectual diversity.' Ultimately, I gesture to the conclusion that intellectual diversity as a mode of thinking degrades into either infinite particularity or impossible singularity that do little establish a call for policy intervention.