Harris vs. Trump: Betting and prediction markets are picking a clear favorite

Either Donald Trump supporters are willing to risk losing a lot of money to manipulate the betting and prediction markets, or they're ignoring polling signs that Kamala Harris has momentum rolling into Election Day — or they're simply sticking by their guy.

According to Vegas Insider , Trump once again has moved into the favorite's role in odds to win the presidential election. Over the past several weeks, Harris slid slightly, then the race tightened again, with Harris even briefly becoming the favorite.

Tuesday, the Insider predicts, "will be a roller-coaster day." Some betting experts believe a bet on Trump could be a simple wager that he'll win Pennsylvania and cut off Harris' most likely path to 270 electoral votes.

It's illegal to bet on political races in the United States, but a federal appeals court recently ruled that wagering in prediction markets is allowed. With polls remaining tight, here's how betting and prediction sites see the race:

Kalshi: With the court clearing the prediction market company to resume taking action on election betting and trading in the United States, action has been brisk.

As a prediction market and not a sportsbook, Kalshi expresses odds in percentages, and the money being wagered sets the odds, which have been volatile over the past week, similar to the betting markets.

As polls opened on Tuesday morning, Kalshi has Trump favored at 58%, with Harris at 42%.

Trump peaked at 64% last week, but Harris rallied to briefly take the lead at 50.8% on Saturday.

Ladbrokes: In mid-September, shortly after the first and only debate between Trump and Harris, the Vice President was -120 and Trump was even money in the European betting site's presidential election odds.

Since then, Trump grew to a -200 favorite to Harris' +175 price. But the race has tightened and stands at Trump -150 and Harris +130, even though the popular-vote markets favor Harris.

Polymarket: The Wall Street Journal reported recently that this prediction site likely was being manipulated by Trump supporters, who have been plowing money on his side of the ledger, possibly to give the appearance of momentum. It currently stands at Trump 60.9% to Harris 39.1%.

Also: Betting on presidential election odds is also available in Canada, in the Ontario province. BetMGM Canada has Trump -155/Harris +130, while FanDuel is at Trump -158/Harris +132.

At BetMGM UK, it's Trump -150/Harris +125.