The U.S. stock market struggled to gain momentum on Monday as investors remained cautious ahead of Election Day on Tuesday. Vice President Kamala Harris holds a 1-point lead over ex-President Donald Trump, according to the New York Times national polling average; she has a 4-point lead among likely voters nationally, according to the latest PBS News/NPR/Marist poll. Betting markets, as tracked by the CFTC-regulated Kalshi, favor a Trump win at a 53% chance, but with diminishing odds compared to previous weeks. Also, the betting odds are susceptible to wild swings from so-called “whale” bettors…