Donald Trump’s victory is already inspiring reflection about the future of the Republican Party, and rightly so, but Democrats don’t seem to be undertaking any similar introspection. This is a mistake, because they wouldn’t have been ushered out of power up and down the ballot if the American public wasn’t rejecting the results and methods of the last eight years.

Liberals are attributing Hillary Clinton’s loss to FBI Director Jim Comey, while the more honest admit her email scandal and Clinton Foundation ethics were problems....