Washington DC – More than 300,000 people are gathered on the mall today for the March on Washington, with at least 150,000 on each side of the reflecting pool. The massive crowd is largely African-American, mobilized by the 50-year anniversary of Martin Luther King’s speech and by the pressing demand for justice for Trayvon Martin. African-American groups range from Florida’s Dream Defenders, to New Jersey’s People’s Organization for Progress, to the national NAACP. There is also a big union mobilization, with the United Auto Workers turning out thousands of members in t-shirts. Many other unions and their associated groups like Working America are also out in force.