Katrina Pierson isn’t who most people picture when they think of the Tea Party. The movement is, according to a recent poll, 83 percent white, and the 37-year-old political activist is a black woman who, given her multiracial background, might have been derisively described by fellow Texan Ted Nugent as a “mongrel”—just as he referred to President Barack Obama, also biracial, a month ago. But demography aside, Pierson is all Tea Party.