Life After Iowa: Harold Meyerson, plus Taylor Branch on MLK from Selma to Memphis

It's been a big week in American politics: Monday: the long awaited Iowa Democratic caucuses failed to give results; Tuesday: Trump gave his State of the Union address; Wednesday: the Senate Republican majority voted NOT to convict Trump of high crimes and misdemeanors or to remove him from office; and today Trump gave a 63-minute victory speech -- Harold Meyerson comments. Next up: February is Black History month -- we talk with Taylor Branch about Martin Luther King Jr. from 1965 and the Selma campaign to 1968 and the Memphis sanitation strike.