Kamala Harris leads Trump in polls on the eve of the Democratic National Convention

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United States Vice President Kamala Harris is leading former President Donald Trump as she prepares for her headline moment at the Democratic National Convention, opinion polling shows.

On the eve of the convention in Chicago, Harris holds a lead of between three and six percentage points in the race for the White House, two opinion polls showed on Sunday.

Earlier Harris and her running mate Tim Walz took a road trip to Pennsylvania, in a push to convince undecided voters in the key battleground state. Pennsylvania has tipped the balance in several elections, often by a tiny margin.