Former Vice President Joe Biden speaks at a campaign event Wednesday in Somersworth, N.H. There, he went after Vermont Sen. Bernie Sanders as a “democratic socialist” and called former South Bend, Ind., Mayor Pete Buttigieg a “risk.”

Former Vice President Joe Biden speaks at a campaign event Wednesday in Somersworth, N.H. There, he went after Vermont Sen. Bernie Sanders as a “democratic socialist” and called former South Bend, Ind., Mayor Pete Buttigieg a “risk.”