Amid rising pressure for President Biden to withdraw from the race, questions are looming over the mechanics of getting another Democrat on the ballot ahead of November. Democrats do have a path forward: The filing deadline for the party to get their presidential candidate on the ballot in most states hasn’t been met yet, and there are avenues within the party over how to choose a new candidate if need be. Much of the chatter over Biden’s fate for now is speculation, as the president and his campaign maintain he is committed to running for another term. Still, some Democrats...