Election night: Five data points to track in the midterms

Midterm elections generate a high volume of results across federal and state offices. To determine which party will control Congress, observers are focusing on specific early indicators and historical voting patterns. The following data points offer a framework for evaluating the night's outcome.

Indiana and Kentucky will report results in the 6 p.m. ET hour, while Florida splits its reporting time. House races in Florida may yield results by 7 p.m. ET, though statewide contests like the Senate race will not be called until 8 p.m. ET at the earliest. Early bellwethers include Indiana's 5th and Kentucky's 6th Congressional Districts. Both seats are currently held by Republicans but have become more competitive. If these races are close or trend toward Democrats, it suggests lower Republican turnout or a larger Democratic surge. Florida's 22nd District, redrawn to favor Republicans, and the 27th District, which has a heavy Latino population, will also provide early signals on how key subgroups are voting.

Republican success in recent decades has correlated with winning at least 46% of independent voters. Before the current political alignment, candidates like Mitt Romney won larger shares of independents in 2012 but still lost. Since then, blue-collar white voters have shifted toward the Republican party, while better-educated white voters have moved toward Democrats. Independents remain a lower-propensity voting group in midterm cycles, making this 46% threshold a critical benchmark for the Republican ticket.

The Michigan Senate race is a key determinant for Senate control. If Republicans win this seat, Democrats must flip five Republican-held seats to gain the majority; otherwise, they need only four. Abdul El-Sayed, the Democratic nominee, relies heavily on Black voters in Wayne County. Historical data shows Democrats have needed at least 68% of the vote in Wayne County to win statewide unless they overperform in the suburbs. In 2024, Sen. Elissa Slotkin won with 63% in Wayne County, aided by suburban gains. In 2020, Biden and Peters both secured 68%. In 2018, Stabenow won with 69%. Clinton lost in 2016 with 66%, and Harris lost in 2024 with 62%.

Turnout among voters aged 18 to 29 drops sharply from presidential to midterm elections. In presidential races since 1992, 43% of registered young voters cast ballots. In midterms, that figure falls to 21%. Despite lower turnout, this demographic is vital for Democratic success. Over the last 20 years, Democrats have won the presidency or made midterm gains when they won this group by more than 20 points. The exception was 2022, where Democrats won young voters by 28 points. In that cycle, Republicans took the House, but Democrats gained a Senate seat, limiting the Republican sweep.

In Texas, the Senate race between Democrat James Talarico and Republican Ken Paxton will hinge on specific voter margins. Polling errors in Texas have previously underestimated the Republican vote, creating skepticism about Talarico's lead. No Democrat has won a statewide office in Texas since 1994, nor a Senate seat in 38 years. Trump won the state by 14 points in 2024. Analysts suggest Talarico needs to outperform Beto O'Rourke's 2018 totals in key Latino-heavy counties, including Cameron, Hidalgo, Webb, and Nueces. Additionally, the vote difference between Republican Governor Greg Abbott and Paxton is a key metric. In 2018, Abbott outperformed Sen. Ted Cruz by about 400,000 votes, yet Cruz won by over 200,000. If Abbott's lead over Paxton exceeds 400,000 votes, it poses a significant hurdle for Talarico.