Mississippi’s Senate contest between incumbent Republican Cindy Hyde-Smith and Democratic challenger Scott Colom has produced the narrowest margin among 2026 races, with Colom holding a lead of fewer than 100 votes out of nearly one million cast after 96 percent reporting. Late returns from majority-Black counties and high provisional-ballot volume in Democratic-leaning areas have kept the outcome unresolved, prompting traders to assign Mississippi a 91 percent chance of finishing closest. An independent candidate drawing roughly 2 percent further fragments the tally. Remaining absentee and affidavit ballots, concentrated in specific counties, plus the absence of automatic recounts, could still shift the final difference by enough to alter the ranking relative to other tight races such as Alaska.