To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Share Embed Share URL Video File Node URL Embed Code <iframe title="MRC TV video player" width="640" height="360" src="https://www.mrctv.org/embed/1488" allowfullscreen></iframe> Hip Hop artist Head Roc performed at a rally at the University of Maryland for Green Party presidential candidate Cynthia McKinney, a former congresswoman, on Feb. 19, 2008.