Everywhere you turn in the world of sports, in seemingly every league, in amateur, college and professional ranks, you find athletes carrying the banner of some sort of political protest. But it started with Muhammad Ali.
Today, there's LeBron James, Dwyane Wade and their teammates wearing gray hoodies in support of Trayvon Martin.
The Chicago Bulls' Derrick Rose donning a T-shirt that reads "I CAN'T BREATHE" before another game.
Minnesota Vikings punter Chris Kluwe taking a stand in favor of same-sex marriage.