Winnow: verb. To expose (grain or other substances) to the wind or to a current of air so that the lighter particles are separated or blown away.
— Oxford English Dictionary
It is time to dust off this marvelously appropriate verb for its quadrennial use to describe the thinning of a field of presidential aspirants. After two rounds of quasi-debates — “10-participant debate” is a quasi-oxymoron — the Democratic field is well on its way to contraction.
Joe Biden survived his second debate, but did not dispel the impression that the brittleness of his candidacy is more important than his double-digit lead in a field the congestion of which is, for now, his friend. He has never been the Democrats’ Demosthenes. Now, however, when he commits the sort of verbal fender-benders that have long characterized him, many people will wonder whether he is showing his age, 76.
Biden’s neon smile is a nice contrast with the snarl that defines the leader of the other party, but Democrats must consider this: If they nominate Biden, they will be hostages to his health, and if he catches a cold in October 2020, the electorate might get chills.