Why the red wave didn’t come

Democrats outperformed history and expectations with a surprisingly strong midterm elections performance Tuesday, with the promised red wave nowhere to be found.

The best news for the GOP is that they appear to be the favorites to narrowly retake the House of Representatives, though the outcomes of key races have not yet been called. Apart from that, the results so far are a litany of disappointments for Republicans.

In the Senate, the contests that will determine control — Georgia, Nevada, and Arizona — have not yet been called. But Democrats...