Why are there comparatively few academic conservatives? The Chronicle of Higher Education provides some answers based on a paper by Matthew Woessner & April Kelly-Wessner.
Conservatives are not as interested in the issues that might go into a doctorate, feel discriminated against by professors - ‘liberal enclaves provide a chilly environment’ - and have more interest in raising a family than liberal students. On the latter point one way of broadening the range of views in academic departments would be to provide better childcare facilities.
Conservatives are also less interested in doing original work and more interested in financial success than are liberals.
In my limited experience economics departments provide a mix of ideological approaches with many right-wing academics supporting free market policies but plenty of old-fashioned lefties working in areas such as industrial relations and labour economics. This often translates into support for a diverse range of political positions. Many arts-based departments (especially politics) however are overwhelmingly left-wing with a crushingly tedious orthodoxy of left-wing babblers and social romantics. I cannot imagine conservative students feeling at home in such departments.
I think it is very important to reconstitute political science departments so that they do teach about politics and not just left-wing ideology. The central role they attach to Marxist theory is totally ridiculous. Most would be better-off learning about markets and modern economics.