The "Tea Party" movement—a frothy mix of angry white populism and well-funded professional political campaigning—is about taking our country back from the socialists, and also about holding up terribly embarrassing signs. Here's one with a really bad word!
And the guy holding the sign? He is Dale Robertson, who is the self-described "President and Founder of the Tea Party." He owns and operates TeaParty.org. So, yes, this is an actual organizer of the movement, and not just some dude. His sign reads, in full: "Congress = Slaveowner / Taxpayer = Niggar." Maybe he thinks he is allowed to use that word if he spells it wrong?