I am speaking solely from anecdotes, but Social Science grad students generally have a Rabbi from early on their career. That is, they are favorite students, close students to at least one powerful/influential figure in their field. A lot of favoritism and a different kind of nepotism play an important part Social Sciences academia.
And to be successful in Social Sciences academia, you need a "mentor"/"Rabbi", and also be a proponent of a certain kind of politics.