Should Sanders Drop Out?

Bernie Sanders embattle campaign for the Democratic nomination is pressing onward.
Politico reports that Sanders is not dropping out and will remain in the race "perhaps remaining in the presidential race for months to come.”
Joe Biden is leading in the delegate count. He also has a double digit lead over Sanders in the polls nationally.
Yet, Bernie is still in the race.
Should he drop out?
Jim Geraghty at the National Review thinks so.
Geraghty said that the nominating contest is over and Sanders is only dragging down the party by refusing to end his campaign.