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US Vice President Kamala Harris opened up a marginal two-percentage-point lead over Republican Donald Trump after President Joe Biden ended his re-election campaign and passed the torch to her, a Reuters/Ipsos poll found.
The poll, conducted on Monday and Tuesday, followed both the Republican National Convention where Trump on Thursday formally accepted his party's nomination and the Biden announcement on Sunday he was leaving the race and endorsing Harris.
Harris, whose campaign says she has secured the Democratic nomination, led Trump 44 per cent to 42 per cent in the national poll, a difference within the 3-percentage-point margin of error.
Harris and Trump were tied at 44 per cent in a July 15-16 poll, and Trump led by one percentage point in a July 1-2 poll, both within the same margin of error.
While nationwide surveys give important signals of American support for political candidates, just a handful of competitive states typically tilt the balance in the US Electoral College, which ultimately decides who wins a presidential election.
The most recent poll showed 56 per cent of registered voters agreed with a statement that Harris, 59, was "mentally sharp and able to deal with challenges," compared to 49 per cent who said the same of Trump, 78.
