Who are the swing voters in America?

DURING HIS two previous presidential campaigns, Donald Trump never led general-election polling averages for a single day. In 2016 he pulled within a percentage point of Hillary Clinton in July and September, but trailed in the opinion polls by four on election day. Four years later Joe Biden enjoyed a large, stable advantage over Mr Trump throughout the race, and ended it with an eight-point edge, according to pollsters. In both contests such surveys sharply underestimated the support Mr Trump received on election day, particularly in swing states.

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).