Who are the swing voters in America?

Today, the first former president seeking to return to office since 1912 is in the strongest position in polls of his electoral career. Mr Trump first inched ahead of Mr Biden, the incumbent, in national surveys last September, and has held a narrow lead for most of 2024. Our national poll tracker has them tied now, but state-level polls give Mr Trump clear leads in four of the six states that could plausibly decide the election (Arizona, Georgia, Michigan, Nevada, Pennsylvania and Wisconsin).