The closely contested Alaska U.S. Senate top-four primary on August 18, 2026, between incumbent Republican Dan Sullivan and Democratic challenger Mary Peltola has produced tight polling averages and high uncertainty around total first-round turnout. With roughly 602,000 registered voters—including a dominant 63% nonpartisan or undeclared bloc—campaign mobilization, early voting participation, and weather on election day are key variables. Recent surveys from Alaska Survey Research and Data for Progress show the race within a few points in first-round preferences, while the presence of a second candidate named Dan Sullivan adds potential ballot confusion that could suppress or fragment participation. Trader pricing across turnout buckets reflects this balanced dynamic, where stronger urban or rural mobilization, or shifts in late undecided voters, could push totals higher or lower than historical midterms benchmarks before ranked-choice voting advances the top four.