One of the recent biographies on Jagger mentioned Politics, I think, although I'd need to check. Maybe someone else has that info handy.
There's a tendency amongst a lot of journalists and commentators when pontificating about the Stones' wealth/greed etc to throw in the 'Mick studied at the LSE, you know' angle to back up an opinion on how business obsessed he has apparently been from an early age, (the full name of the college is "The London School of Economics and Political Science" but its not just limited to those two subjects.
Interesting background on the college on Wikipedia - [en.wikipedia.org
Alumni include JFK, Queen Margrethe II of Denmark, Romano Prodi, Pierre Trudeau (nice little Stones connection there), Cherie Blair, James Bond (!!) and er.. Monica Lewinsky...