Super Tuesday---Showdown: Coast to Coast

Coverage of the voting in primaries and caucuses in 24 states, in which about 50 percent of the total Democratic delegates and 45 percent of the Republican delegates will be selected. Charles Gibson, Diane Sawyer and George Stephanopoulos are the anchors, with reports from John Berman, Ron Claiborne, David Muir, Kate Snow, Jake Tapper, David Wright, Bianna Golodryga and Cynthia McFadden.