The U.S. Supreme Court on Monday will hear arguments in a consequential case to determine at what point states can accept and count mail-in ballots. The case, Watson v. RNC, challenges a Mississippi law that allows mail-in ballots to be received up to five days after Election Day, as long as the ballot is postmarked by Election Day. Fourteen states and the District of Columbia also allow mail-in ballots to be received after Election Day. Jason Snead, executive director of the Honest Elections Project, said the case would give an opportunity for mail-in ballot laws to be uniform across the...