Christopher Hayes on Obama’s announcement:

In his speech, Obama recited moments in American history when politics became something more than the mundane mechanics of governing and effected a true transformation of the polity: the civil war, the New Deal, the civil rights movement. But the problem is that those were moments not of unity, but of extreme polarization. The South only granted rights to black citizens under force of arms, armies of unruly war veterans gathered in Washington DC during the Great Depression to demand the government provide them with a safety net, and when Martin Luther King Jr went marching through the South, he was met with batons and firehoses and accusations that he was dividing people and stirring up trouble.