Donald Trump has regained his advantage over Kamala Harris in online prediction markets on the final day before the election, but FiveThirtyEight and Nate Silver aren’t so sure. What Happened: Harris moved ahead of Trump on the Kalshi betting market over the weekend, but as of Monday afternoon, Kalshi wagerers are giving Trump a 54% chance of victory, expecting Trump to win in Arizona, Georgia, Nevada, North Carolina, and Pennsylvania, with Harris carrying Michigan and Wisconsin. But Kalshi betters also say there is a 75% chance that Harris will win the national popular vote. On Polymarket, Tr…