Jonathan Chait: “Experienced in the moment, Barack Obama’s speech to the Democratic National Convention in Chicago felt like the rousing culmination of a pep rally, peppered with funny insults of Donald Trump and familiar soaring patriotic oratory. But if you read it more closely, an argument emerges: against Trump and also against Obama’s own skeptics, including those within the Democratic Party who have turned away from his legacy.” “Obama first electrified his party 20 years ago at the Democratic convention in Boston with a hopeful speech disdaining social division.