If you don't really understand how media bias works, you'll miss it a lot of the time. Media bias isn't just a matter of supposedly objective reporters slipping editorial comments into what should be straight news stories, although it's sometimes that. Just as often, it's what they choose to present to you as the lead that defines what the story is.
Consider the following story lead from USA Today, which has been flipping out recently over the gall of some baseball players in daring to express opinions of a conservative nature. The story is that Curt Schilling, the one-time major league pitcher who's thinking about running against Elizabeth Warren in Massachusetts, expressed wonderment about why so many Jewish people support the Democratic Party, given the Democrats antipathy toward Israel.