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Joe Biden has an eight-point leader over Donald Trump among registered voters, a Reuters/Ipsos poll has found.
The former vice president had support from 46 per cent of the group to the incumbent’s 38 per cent, pollsters discovered.
The remaining 16 per cent were undecided, may not vote or planned to back a third candidate, the survey, carried out between 15 and 21 July, found.
However, if they had to choose between the two leading candidates, 61 per cent of undecided registered voters would pick Mr Biden, they said.
Both Democratic and Republican campaigns have focused much of their time on reaching out to this pool of potential support, which could swing a close election in either direction.
At the same time, a Democratic super PAC is hoping to close the so-called enthusiasm gap between supporters of Mr Biden and Mr Trump.
PACRONYM warns that Mr Biden is leading many polls “by default” and may lose his advantage unless Democrats give key groups of voters better reasons to get excited about their nominee.
Beginning in August, the group and its sister nonprofit will begin a $15m online ad campaign aimed at about 1.7 million “low-information” left-leaning voters – largely women of color under 35.
Those people are spread across battleground states like Michigan, Pennsylvania, Wisconsin, North Carolina, Arizona and Georgia. Activists believe they do not know much about Mr Biden and likely would not turn out to vote without encouragement.