Chris Pappas holds an 87% implied probability in the New Hampshire Senate race primarily because recent polling and the state's recent voting patterns in federal contests favor the Democrat in this open seat. A late-September University of New Hampshire survey showed Pappas ahead 50-42, reversing an earlier August tie or slight Sununu edge with the same pollster. Both candidates won their September 8 primaries comfortably—Pappas over a progressive challenger and Sununu over former Sen. Scott Brown—setting up a general-election matchup for retiring Sen. Jeanne Shaheen's seat. GOP outside spending has outpaced Democratic efforts, yet Pappas maintains stronger cash reserves and benefits from New Hampshire's split-ticket history and limited Republican Senate success since 2010. Forecasters rate the contest a toss-up or lean Democratic, though market pricing reflects trader consensus on Pappas's narrower but consistent path to victory.