Who decides when an election is over?

The media don’t determine the winner, and President Trump has the right not to concede. But there are after-effects. Enter America’s next great civics lesson.

Dear reader:

When the presidential race was “called” last Saturday for former Vice President Joe Biden, I was sitting with a few other reporters in an Italian restaurant near the Trump National Golf Club in northern Virginia. We, the White House “press pool,” weren’t invited to accompany President Donald Trump into his club. But when it came time to leave, we got to see...