Justin Sullivan/Getty ImagesPrediction markets show Trump leading Harris in 2024 election odds.The betting platform Polymarket has seen its trading volume surge, with $1.24 billion in October alone.A $30 million bet on Trump has raised questions about how big bettors can swing the odds.With the presidential election less than three weeks away, polls indicate former President Donald Trump and Vice President Kamala Harris are in a virtual dead heat.But the election odds look somewhat different in the prediction markets, where people can bet money on the outcome of a race, and the constantly changing odds of a Harris or Trump win on these marketplaces are being closely watched by politicos.Since the start of October, there's been a notable divergence between the betting markets and the polls.