Democratic presidential candidate Kamala Harris has a lead over her Republican rival Donald Trump in three battleground states that will be key in the upcoming United States election, according to a new poll.

The New York Times/Siena College poll released on Saturday showed Harris with 50 percent support among voters in Michigan, Pennsylvania and Wisconsin, compared with Trump’s 46 percent support in each state.

The findings come just weeks after Harris launched her push for the White House following US President Joe Biden’s decision last month to drop out of the race over concerns about his age and ability to serve another term in office.

Since Harris formally launched her campaign, the US vice president has secured strong backing from key segments of the Democratic Party’s base – notably young voters and people of colour – as well as donors and top Democratic lawmakers.

Her decision to name Minnesota Governor Tim Walz as her vice-presidential running mate this week also spurred a new wave of enthusiasm for the Democratic ticket.

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