Checking US Senate Odds on Eve of Election Day

• With Election Day looming and the midterms set to determine Senate control, Democrats are increasingly enthusiastic that they will secure the four seats necessary to take the majority
• Not long ago, US Senate odds were leaning toward the Republicans retaining the Senate; now, it has not just tilted toward the Democrats, it is heavily favoring them
• Given lingering skepticism about poll accuracy, prediction markets have become a key indicator for US Senate odds, and they now project a blue wave with the chance of a blue tsunami

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Election Day is almost here, and US Senate odds from prediction markets suggest a major shakeup could be on the cards. It’s one of the most closely-tracked outcomes for the midterm elections, as the balance of power in the Senate chamber will determine the final two years of President Donald J. Trump’s term.

If the Republicans maintain control of the upper chamber, he retains significant power; if the Democrats gain those four net seats, he will face roadblocks and outright hostility as a lame duck. The US Senate odds are now heavily favoring a huge night for the Democrats, with it overwhelmingly likely they flip Maine and North Carolina while holding Michigan. To make it more worrisome for the GOP, Ohio and Iowa are under threat and Republican bastions where it was once unthinkable for a Democrat to win — Texas, Alaska, and Kansas — are in danger of flipping blue.

Still, polls show the historically Republican states are all within the margin of error despite Democrats leading. And Michigan’s uneasy truce between the Democratic Socialists and “conventional” Democrats to beat their perceived common enemy has come apart with Rep. Haley Stevens, who lost in the Democratic primary, coming out against nominee Abdul El-Sayed and crossing party lines to endorse Republican nominee Mike Rogers.

Prediction markets strongly believe the Democrats are taking control of the Senate. However, as the Trump era has shown, anything can happen even on the eve of the full vote. For those interested in weighing in, there is a great opportunity to do so and garner profit.

US Senate Odds on Prediction Markets: Trade on Midterm Elections

For those who want to jump in, the Kalshi promo code offers a sign up bonus for new users when they get started.

Trading volume for this market is now past $150M and will continue to rise throughout election night.

The Democrats are currently trading at 75% implied probability to take control of the Senate. The market shows just a 25% implied probability of the Republicans keeping their majority.

Read on for a further breakdown of US Senate odds to trade on the best prediction markets for midterm elections.

Polls Aside, the Senate is Still Up for Grabs

Polling was once viewed as an effective gauge as to how particular elections were going to turn out. Despite the occasional misstep, most news organizations and campaigns used public and private polling data to determine how to proceed. However, since Trump came down the escalator at Trump Tower to announce his candidacy for POTUS in 2015, polling methodologies have been called into question, if not outright ridiculed and rendered unreliable. There’s good reason for that since it was wrong in 2016. In 2020, the outcome was closer than polls suggested even though Trump lost. And 2024 was even worse for the Democrats than 2016.

But results are results. That goes for polls and actual elections.

The US Senate odds from prediction markets suggest the Democrats will win the necessary four net seats and take the majority. If the polls are taken at face value, the Democrats are, on the surface, expecting a great outcome. But before going all in with a blue wave/tsunami, it’s important to look at the individual races and the states’ histories and demographics.

North Carolina is done. It was done as soon as Thom Tillis decided not to run for reelection and Roy Cooper, the Tar Heel State’s beloved former governor, jumped in.

In Maine, the electorate appears to have had enough of Sen. Susan Collins. Her opponent, Troy Jackson, could also be called “random guy with a D next to his name” and still win.

Michigan should be done, but it suddenly isn’t, with the public explosion of tensions between Democratic nominee Abdul El-Sayed and the candidate he defeated for the nomination, Rep. Haley Stevens, culminating in an angry and vindictive Stevens endorsing El-Sayed’s opponent, Mike Rogers. El-Sayed has a big lead, and the polling suggests that undecideds are breaking to him. But the aftermath of this chaos in the final days is still to be determined. El-Sayed is probably going to win anyway.

That’s three seats.

Out of Ohio, Texas, Kansas, Iowa, and Alaska, which are realistic and which are unlikely bordering on unbelievable?

Iowa can go either way with US Rep. Ashley Hinson and Iowa State Rep. Josh Turek neck and neck. This could come down to voter turnout and if the pro-life/pro-choice issue is the determinative factor. If young Dems turn out and that issue is the deciding factor, Turek is going to win.

Ohio? While it is now a reliable red state, the governor’s race between Democrat Amy Acton and Republican Vivek Ramaswamy has descended into the muck, with the GOP putting out an ill-advised campaign ad featuring Acton’s estranged mother that even Republicans say was well over the line. That could filter down to send former Sen. Sherrod Brown back to Washington, D.C.

Then there’s Alaska, Texas, and Kansas.

Alaska is dealing with an apparently shady attempt by Democrats to confuse voters with an unelectable candidate named Dan J. Sullivan on the ballot to challenge sitting Sen. Daniel S. Sullivan, with the only way to differentiate between the two being their middle initials. Regardless of the polls showing the Democrats’ main candidate, Mary Peltola, ahead, it’s a reach to say Alaska will elect a Democrat, whatever unethical tactics they use to do it.

Texas? Ken Paxton is a horrible candidate with rampant allegations of personal and professional misdoings, any one of which should end a campaign. He was shoehorned into the nomination in a Trump fit of pique against sitting Sen. John Cornyn, who would be leading this race and would win reelection. Regardless, it’s Texas. It’s ruby red. And despite the negativity surrounding Paxton, James Talarico’s lead is still within the margin of error. When Texans walk into the booth, will those who are hardcore Republicans bring themselves to vote for a Democrat? Or will they hold their noses and do what they always do and click the person with the “R” next to their name?

And finally, Kansas.

Kansas has not elected a Democratic Senator in almost 100 years. Although Democratic candidate Adam Hamilton is essentially a moderate Republican who’s running as a Democrat and is leading sitting Sen. Roger Marshall in the polls, it cannot be ignored that the state does not send Democrats to DC. It just doesn’t. It’s a glowing red state. In the end, it would be stunning if Hamilton wins.

The Democrats should take control of the Senate. They have more pathways to do so than the GOP has in holding it. But it won’t be the whitewash the irrationally giddy Democrats are hoping for or outright expecting.