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Senate races: 2018 election predictions

Most Likely Outcome

REPUBLICAN SENATE CONTROL

Less likely election result

Margin of error predicts outcome 95% of the time

Forecast just for Senate races on the ballot in 2018

Each race is shaded by who is favored (blue for Democrat, purple for independent and red for Republican) with an arrow indicating how much that side is favored. An arrow pointing to the left or right means a candidate is heavily favored while an upward arrow means a very close race.

Forecast full Senate makeup after 2018 elections

Each state has two halves, one for each senator who represents the state. The arrow tells you how Democratic or Republican the state is expected to be based on an average of the forecast win margin (for seats up this year) and the overall state partisanship for other seats.

Harry Explains the Forecast

What is the margin of error?

Look, we’re making a forecast. It’s not going to be perfect. Anything within this range could reasonably happen, though we expect the result to be close to our best estimate.

How does the prediction update?

The prediction updates every day as more polls come out. The prediction should become more accurate the closer we are to the election.

Harry’s Races to Watch

The 15 races with the smallest margin between parties

Predictions Scorecard

Circles are drawn to mark each prediction made since The Forecast started. The timeline below shows a detailed history of the estimates.

Estimated seat advantage over time

By Harry Enten, Sam Petulla, Parker Quinn, Brice Acree, Vijith Assar, Matthew Conlen, Brad Oyler, Will Mullery, Joyce Tseng and Mark Barilla.

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