The Rev. Al Sharpton has amplified his calls for the Federal Communications Commission (FCC) to keep racist content off the airwaves in light of the Arizona shootings. 

In a series of recent appearances on cable news, Sharpton has made the case for the FCC to step up its regulation of the airwaves, policing not just curse words and nudity, as it does today, but also rooting out comments that viewers might perceive as racist. 

Sharpton has largely focused on conservative pundit Rush Limbaugh in what has amounted to a concerted bid to oust him from the airwaves. Sharpton has singled out Limbaugh's comments comparing President Obama's policies to "reparations" as potentially racist.

 "We're not telling Rush don't say what he wants to say. Say it at home," Sharpton said in December. "Don't get on publicly regulated radio and television that are selectively given licenses and do that to offend someone because of their race or their gender."