Andrew Breitbart today, via a tweet [emphasis added]:

Racist NAACP Leader Says 'Kenneth Gladney Not Black Enough' to Protect. He's an 'Uncle Tom': http://bit.ly/9teN4q

Breitbart in the very recent past:

The worst thing you can do right now in the United States, in politically correct America, is to accuse somebody of being a racism [sic] through slurs and innuendo without evidence."