Democratic Senate incumbents seeking renomination in 2026 have cleared their primaries without defeat, consistent with the market's 99.4% price on zero losses. Most seats held by retiring Democrats shifted to open contests, while those with incumbents—such as Chris Coons in Delaware, Edward Markey in Massachusetts, and Jack Reed in Rhode Island—featured long-shot or generational challengers who failed to advance. Primary outcomes reflected standard advantages in fundraising, endorsements from party organizations, and voter familiarity, even amid broader intra-party tensions over strategy and ideology in the cycle. Remaining or recently completed races show no evidence of viable upsets. A surprise defeat would require an unforeseen late development, such as a major scandal or turnout anomaly in an uncalled contest, though historical patterns and completed results make such shifts improbable.