Democrats, despite their hypersensitive, bleeding-heart reputation, can be harsh. Ruthless, even.

When it comes to picking their presidential nominee, it’s often one and done. Walter Mondale, Michael Dukakis, Al Gore and John Kerry were embraced and then, after leading their party to disappointing defeat, cast off like so many wads of wet tissue.

Compare that with Republicans, who not only believe in second chances but, more often than not, seem to prefer their presidential candidates recycled. Over the last half century, all but a few of the GOP’s nominees have had at least one failed White House bid on their resume.

The roster of retreads includes the current occupant of the Oval Office, who is only the second president in U.S. history to regain the perch after losing it four years pr

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