Joe Biden’s pitch to voters has been remarkably consistent: he says he can unite older voters, people of color, and moderates into a coalition that can defeat Donald Trump. A series of gaffes, concerns about his voting record, and disappointing results in the early primaries seemed to doom Biden’s candidacy. But big victories in South Carolina and on Super Tuesday have given new credence to his claim that he’s the best person to take on Trump in November. Evan Osnos joins Dorothy Wickenden to discuss how Biden became the Democratic front-runner and how he’ll go about winning over skeptical young, progressive voters.