The president makes a forceful case for Clinton and warns against the threat of ‘homegrown demagogues.’ Twelve years after he first addressed a Democratic National Convention, and eight years after he became the first black presidential nominee of a major party, President Barack Obama President Barack Obama cast the election to succeed him as a “fundamental choice.” Speaking on the penultimate night of the convention, Obama made a forceful case for his former rival. He’s not likely to have an audience like this again as president, and Obama soaked in the cheers from a party that, despite its divisions, remains...