I watch Foxnews more than the others. It is the highest rated because it caters more towards conservatives and Libertarians. So, it gets that market share. This does show a bias, however, what that also indicates is that CNN, NBC, ABC, CBS, MSNBC and just about all other news networks including fake news like the Daily Show all cater to the other side. If there were more conservative news outlets, then Fox wouldn't be the biggest because it would have to split that market share.
That being said, I always thought of MMA and boxing as more a sport that caters to conservative minded people. Many liberal progressives look down upon fighting sports as barbaric.