The Rev. Martin Luther King Jr. died trying to beat the trick. The trick is when white politicians persuade poor white working class people that the source of their pain is people of color, immigrants and other scapegoats. King recruited impoverished white residents of Appalachia, Latino farm workers from California and impoverished blacks from Mississippi. It was a Rainbow Coalition before the term was even coined. Organizers for a “new Poor People’s Campaign” and the Fight for $15 movement will launch rallies across the mid-South to raise awareness of the plight of the nation’s poor. The campaign is calling for thousands of cooks and cashiers to walk off their jobs Monday and join protests in two dozen cities.