New Jersey's 11th Congressional District covers parts of Essex, Morris, and Passaic counties in the northern part of the state. It includes suburbs such as Montclair, West Orange, Livingston, and parts of Wayne. The district has been represented by Democrat Mikie Sherrill since 2019. The 2026 election will determine whether Sherrill or a Republican challenger wins the seat, and this prediction market focuses on the Democratic margin of victory in percentage points. The district was historically Republican. From 1985 to 2019, it was represented by Republican Rodney Frelinghuysen, who chaired the House Appropriations Committee. Frelinghuysen retired in 2018 after 12 terms. Sherrill, a former Navy helicopter pilot and federal prosecutor, flipped the seat in 2018 by 11.3 percentage points. She won reelection in 2020 by 7.5 points, in 2022 by 8.8 points, and in 2024 by a margin that is still being finalized but was around 10 points. Interest in this market stems from the district's competitive nature. While Sherrill has won four times, the district has a Cook Partisan Voting Index (PVI) of D+6, meaning it leans Democratic but is not a safe seat. National trends, candidate quality, and turnout in presidential years versus midterms affect the margin. The 2026 election is a midterm, which could shift turnout patterns. The market specifically asks about the Democratic margin of victory, so the final vote share difference between the Democrat and the second-place finisher is the key metric. People follow this market to gauge Democratic strength in suburban districts. A wide margin suggests the party's coalition is holding up. A narrow margin or a Republican win would signal weakness. The outcome has implications for control of the House and for the national political environment heading into the 2028 presidential cycle.

Historical Context

New Jersey's 11th District was created in its current form after the 2010 census. Before that, it covered different areas. The district has a history of electing Republicans for most of the 20th and early 21st centuries. From 1985 to 2018, it was held by the Frelinghuysen family. Rodney Frelinghuysen's father, Peter Frelinghuysen, held the seat from 1955 to 1975. This long Republican hold reflected the district's suburban, relatively affluent character. The 2018 election was a turning point. Sherrill won 53.6% to 42.3% against Republican Jay Webber, a margin of 11.3 points. That was part of a national wave that gave Democrats the House majority. In 2020, Sherrill faced Republican Rosemary Becchi and won 53.3% to 45.8%, a margin of 7.5 points. That was a closer race, partly due to presidential-year turnout and national polarization. In 2022, a midterm election, Sherrill defeated Republican Paul DeGroot 55.0% to 46.2%, a margin of 8.8 points. That was better than many Democratic incumbents in competitive districts, who often lost ground in the midterm. In 2024, Sherrill won against Republican Joseph Belnome by approximately 10 points, though final certified results were pending. The district's PVI shifted from D+6 to D+6 after the 2020 redistricting, meaning it remains a lean Democratic seat. Historical margins show that Sherrill has never won by less than 7.5 points. The 2020 margin was the closest. The 2026 election will be a midterm, which historically favors the party not holding the White House. If a Republican is president in 2026, that could narrow the Democratic margin. If a Democrat is president, the margin might widen. Turnout in midterms is lower and older, which could benefit Republicans.

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