A spate of opinion polls carried out since Joe Biden abandoned his presidential campaign last Sunday show the vice-president, Kamala Harris, closing the gap on Donald Trump but still narrowly trailing in a tight race.
While still often narrowly behind, the ability of Harris, now the presumptive Democratic nominee, to gain ground on her Republican opponent suggests her elevation to the top of the ticket has reset the presidential race, pollsters say, especially after weeks of plummeting Democratic poll numbers under Biden.
