I recall another thread about the political leanings of various sports fans....as I recall the most heavily Democrat were the fans of the WNBA.
When it comes to politics, world soccer is probably the most diverse of any sport. You have everyone from Politburo members to Francisco Franco in the rooting sections, and every ideology you could think of. In 78, the right wing Argentine Junta and the leftest urban guerillas went on ceasefire during World Cup.