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Bill Clinton

Enter President Trump

Enter President Trump

Convincing victories by political outsiders in New Hampshire demonstrate without doubt that most voters are disgusted with both political parties. The electorate will probably make one of them — more likely Donald Trump — the next commander in chief.

Since 1976, just one candidate won his party's nomination after failing to win either Iowa or New Hampshire: Bill Clinton in 1992. While history clearly is not determinative, it can hardly be ignored.

On the Republican side, Mr. Trump won by a compelling margin in the Granite State over Iowa winner Ted Cruz — 36 to 12 percent — because he did well among both moderates and conservatives and most age...