Democratic Party leaders are intensifying efforts to encourage remaining uncommitted superdelegates to make their choice public by the middle of next week. On Saturday a special rules committee will meet to determine whether to seat the delegates from Florida and Michigan. John Hockenberry gets the perspective of Democratic political consultant Joe Trippi. Puerto Ricans go to the poll on Sunday for the Democratic primary their only chance to have their say in the presidential race. With historically high-turnout, the race is one of the last few contests that could sustain Hillary Clinton s bid. Reporter Carol King gives us the story from Puerto Rico.

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