Election forecaster Inside Elections shifted the New Hampshire Senate race from “tilts Democrat” to a “toss-up” rating on Wednesday, following the momentum behind GOP candidate and former Sen. John Sununu in his bid to reclaim his seat.

The rating shift comes just days before New Hampshire’s Senate primary on Tuesday, Sept. 8, in which Sununu is expected to win against the other GOP candidate, former ambassador to New Zealand, Scott Brown. On the Democratic side of the ballot, Rep. Chris Pappas (D-NH) is largely expected to advance to the general election in his matchup against socialist Karishma Manzur.

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The Democratic Senate primary between Pappas and Manzur, however, has appeared to tighten in recent polling, while Sununu has increased his double-digit margins against Brown in recent surveys. Sununu’s momentum is evident in general election polling, with him leading Pappas by 2 percentage points in the most recent University of New Hampshire survey on the race.