Say what? Let's look at how they identify themselves, shall we?
Media Matters for America is a Web-based, not-for-profit, 501(c)(3) progressive research and information center dedicated to comprehensively monitoring, analyzing, and correcting conservative misinformation in the U.S. media.(emphasis mine)
Hillary Clinton bragged about helping Media Matters get started. They have done nothing but lie about conservatives from the day they first started up. And now they're trying to say that they're not political?
Lies. Blatant, outright lies.