Reilly Neill leads Polymarket trader consensus at 79% implied probability to win the Montana Democratic Senate primary, driven by her superior fundraising—over $100,000 raised compared to rivals' lower totals—and endorsements from progressive groups criticizing incumbent Jon Tester's moderate record on issues like public lands and healthcare. Recent developments include Neill's active campaigning in key areas like Missoula and Bozeman, where she holds events drawing larger crowds, alongside internal Democratic polling showing her 20+ point lead as the June 4 primary nears. Challengers like Michael Hummert and Kathleen McLaughlin trail due to limited visibility and resources, with no major shifts in the past week; upcoming candidate forums could influence undecided voters in this low-turnout primary.