lawtig02
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Yeah, it’s impossible to know how much is bet on presidential elections because domestic books can’t do it and overseas books generally don’t share their numbers. This is a pretty good analysis, though, albeit from a site with a strong interest in promoting betting.I don't think they said a single NFL game is more heavily bet than the presidential market just that overall the NFL is much larger. From my googling about $1.3b was bet on the 2020 election. For comparison $16b was bet on the Superbowl last year. Its reasonable to think the full NFL betting market is probably $50b or more.
The most popular prez betting market that keeps getting quoted is Polymarket which is a platform for crypto gamblers. As of a week ago they had $592m in bets on the election. But that includes ALL possible candidates. Only about $130m has been bet on either Trump or Kamala.

Do Betting Odds or Polls Accurately Predict the Presidential Election Often? - Oddstrader
Examining the reliability of betting odds and polls in predicting U.S. presidential elections. Which is more accurate?

There are several pros and cons for relying on the betting markets to predict the winner of a U.S. presidential election.
PROS:
- Betting markets can adjust very quickly to real-time news updates of significance, such as a candidate’s health, investigations like the FBI looking into Hillary Clinton’s emails in 2016 right before the election, or if something were to happen with Trump’s sentencing in July this year.
- Bettors put their money where their mouth is and vote the way they bet, and there are millions wagered on elections, so these voters have a vested interest in helping their candidate win their bet for them.
- The odds have good predictive power and a track record of success with favorites usually winning the election outside of 1916, 1948, and 2016.
CONS:
- Market manipulation is possible if some sharks make huge bets that sway the odds in a certain direction, such as when someone bet at least $4 million on Mitt Romney in the 2012 election. It is also possible that the population of bettors are not evenly distributed among Democrats, Republicans, and independents, giving one side an advantage.
- While updating for current news can be good, sometimes that is an overreaction, such as Trump’s guilty verdict this year. After 2 weeks, his odds are right back to where they were before the verdict was read.
- Live betting odds in 2020 grossly overestimated Trump’s chances of winning on election night as the mail-in votes, which were largely done by Joe Biden voters, were not counted until later, which led to Biden’s victory.
- Since the odds are just for the winner, it may not be reflecting the state-wide odds properly in the swing states that should ultimately decide the election winner.