America’s 2016 presidential primary elections have surprised the country’s most seasoned political observers. On the Republican side, those most qualified by distinguished careers of government service, including Jeb Bush and John Kasich, have either abandoned the race or are struggling to stay afloat. Instead, insurgent candidates including tycoon Donald Trump and Senator Ted Cruz are dominating the contest. Among Democrats, Hillary Clinton expected a coronation but has encountered surprisingly vigorous resistance from her septuagenarian socialist challenger, Bernie Sanders, despite her formidable advantages in funding and establishment support. American voters are in a revolutionary mood, with significant implications for the future of the country and its place in the world.