Kasparov's an interesting case.
The Western press often make him out to be some major repressed opposition leader. The Russian government has helped perpetuate that image by shutting down protests which he has organized together with a couple of other organizations (one of them, the National Bolshevik Movement, is very controversial no matter what your politics).
However, while he was once revered as a chess god, Kasparov has almost no following among the Russian public as a politician. I'm not quite sure how an opposition leader can be legitimate if he has no significant support, but the Western press continue to try to legitimize him.
Anyway, will try to give that a listen later on.