With the choice of Kamala Harris as his running mate, Joe Biden has taken another large step toward blowing the election.

To swing voters — suburban soccer moms turned off by President Trump, a swath of white laborers, family-oriented Hispanic women — Harris will prove to be anathema. Her crusading leftism, hard-edged personal style, and facial sneer will make her like 10,000 fingernails on 1,000 loud chalkboards, amplified by a boom microphone so strong it can be heard for hundreds of miles.