Bill Clinton headlined the second night of the Democratic convention, a jubilant celebration of her formal nomination for president. In an important move for party unity, her primary rival Bernie Sanders helped make it official when the roll call got to his home state of Vermont, prompting delegates to erupt in cheers. It was a striking parallel to the role Clinton played eight years ago when she stepped to the microphone on the convention floor in Denver in support of her former rival, Barack Obama.