[ak_yo]

I believe this evidence is consistent with my point that a robust (and perhaps growing!) network of campus conservatism exists.

Specifically, this evidence could be explained by an increasing rate of conservatism on campuses. The rate of disinvitation could be the same, it's just that there's a greater number of conservative speaker invitations going out from a greater number of conservative students. And right leaning speakers are disproportionately invited by right-leaning student organizations.

[workthrowaway27]

I don't have time to find a source right now, but I think conservatism is declining on college campuses. It certainly is among faculty members.