The unambiguous victories of Donald Trump and Bernie Sanders in the New Hampshire presidential primaries confirm that establishment politics in both major parties are in crisis.
Mr. Trump easily rebounded from his loss to Texas Sen. Ted Cruz in Iowa, and Mr. Sanders emphatically built on his virtual tie there with Hillary Clinton, whipping her soundly in the Granite State.
Mr. Cruz and Florida Sen. Marco Rubio were the big losers. Mr. Cruz fell behind Ohio Gov. John Kasich as the GOP runner-up to Mr. Trump, along with Mr. Rubio, the third-place finisher in Iowa, who self-destructed with a robotic performance in that primary-eve New Hampshire debate.
Ironically, the chief...