Yesterday's presidential primaries have altered the landscape for both political parties. The principal casualty was Florida's Republican Senator Marco Rubio, who dropped out of the race for the White House after Donald Trump crushed him in his own state. John Kasich is hanging on by his fingernails, with Ted Cruz still strong enough to help prevent Trump from securing the GOP nomination. With Hillary Clinton taking claiming victory in several states, it was a bad day for Bernie Sanders. We hear about the narrowing field of candidates and what's facing those still standing.