We don't know for certain, but Donald Trump's winning coalition could turn into a lasting political realignment.

acknowledged this erosion of political clout in a memo to party leaders: For the first time in modern history, the perception that Americans have of the two major political parties switched.

For a broader analysis of our political distemper, Daniel Schlozman and Sam Rosenfeld chart the decline of robust and principled ideological sorting across American history in The Hollow Parties.

Justin Trudeau, who has led the country for nearly a decade, is giving up leadership of the Liberal party. He said he would ...