Didn’t know that, here’s some sauce:
In his freshman year (1965) in the School of Foreign Service at Georgetown, future U.S. President Bill Clinton took Quigley's course, receiving a 'B' as his final grade in both semesters (an excellent grade in a course where nearly half the students received D or lower).[2]:94, 96
In 1991, Clinton named Quigley as an important influence on his aspirations and political philosophy, when Clinton launched his presidential campaign in a speech at Georgetown.[2]:96 He mentioned Quigley again during his acceptance speech to the 1992 Democratic National Convention,
https://en.m.wikipedia.org/wiki/Carroll_Quigley#Influence_on_Bill_Clinton