The Mississippi Senate election could be determined by the mail-in ballots received after Election Day, whose legality was upheld by the Supreme Court. The Mississippi Senate race between Republican Cindy Hyde-Smith and Democrat Scott Colom has taken an intriguing turn as candidates are fighting a cutthroat Senate battle. The Senate Majority PAC is spending $1.2 million on statewide ads backing Democrat Scott Colom against Republican Senator Cindy Hyde-Smith in Mississippi.