Sure, ice hockey saw a bit of cold war politics hit the rink, but soccer beats it hands down in terms of the politics that manifest in it.
1. Zissou Headbutt - In last year's World Cup, French soccer star Zinedine Zidane deliberately headbutted Italian player Marco Materazzi after Marco insulted him. Newspapers had lip readers try to determine what Materazzi had said, The New York Times reporting that Materazzi called Zidane "the son of a terrorist *****". Zidane is of Algerian descent, and the comment made by Materazzi is aimed at degrading his mother in terms of her descent and the Islamist fanaticism that can currently be found in Algeria....leading to that awesome (and politically motivated) headbutt. In France, the viewpoint of the French-Algerian colonialists (who were forced to return to France after the revolution for Algerian independence) were very much looked down upon by the mainland French. Materazzi's remark could have stoked this up out of Zinedine.
2. November 07 Ultra Riots in Rome - Ultras (Superfans in Europe are called Ultras) rioted out in Rome. A police bus was set on fire, and police barracks and the Commission for Public Safety were attacked, leaving two-dozen policemen injured. The reason? Gabriele Sandri, a Lazio supporter was accidentally shot by a policeman in the wake of a battle between Lazio Ultras and a group of Juve supporters they attacked. The Ultras held the police responsible and retaliated. This isn't so much a show of politics at a global level, but does show how charged the football rivalries are in Italy and how extreme the reprecussions can be when something goes wrong.
3. Pele causes a ceasefire in the 1970's Biafra War - Soccer God Pele caused a ceasefire in the Nigerian Civil War. The reason? Both sides wanted to stop fighting to watch him play.
I don't think any sport is more political than another sport. However, the fervour of soccer fans, accompanied by the vast number of countries that play it, makes it the most likely sport to manifest political electricity (for the better in example 3, and for the worse in examples 1 and 2).