As Biden struggles, Hillary waits for the call As the primaries roll forward, and especially with officials’ thumbs on the scales, Biden will almost certainly win the candidacy. In the absence of a brokered convention, how could Democrats replace their standard-bearer? One idea has been to convince Biden to step aside in favor of the very popular Michelle Obama, seen as a sure bet to beat Trump. So far, though, the former first lady has reportedly rebuffed all invitations to enter the fray. That leaves Hillary Clinton. Biden could choose Clinton as his running mate, and then step down before...