Anti-vaccine activist Robert F Kennedy Jr, a member of one of the most storied American political families, could draw the support of about one in seven US voters, according to a Reuters/Ipsos poll ahead of his presidential campaign's expected Monday launch.
The poll found that Mr Kennedy, the son and namesake of the slain US senator, could draw votes away from both Democratic president Joe Biden and his likely Republican challenger Donald Trump in the 2024 election. Mr Kennedy is expected to run as an independent.
That is a meaningful complication in a narrowly and bitterly divided country where polls show low enthusiasm for both Mr Biden and former president Trump in a contest that is likely to be decided in a handful of competitive states.
The two-day nationwide poll completed Wednesday found that in a two-way matchup, Mr Biden and Mr Trump each had the support of 35 per cent of respondents, with 11 per cent saying they would vote for some other candidate, 9 per cent saying they would not vote and 9 per cent saying they did not know who they would vote for.
In a hypothetical three-way matchup, Mr Kennedy drew 14 per cent support, Mr Biden's share fell to 31 per cent and Mr Trump's to 33 per cent. About 9 per cent said they wouldn't vote and 13 per cent said they did not know who they would vote for.
That result also showed Mr Biden and Mr Trump essentially tied because the poll was based on an online survey of 1,005 people and had a credibility interval, a measure of precision, of about 4 percentage points in either direction.
Mr Kennedy is expected to announce in Philadelphia on Monday that he will drop his challenge to Mr Biden for the Democratic Party's nomination, and run as an independent candidate instead.
While not considered a top contender for the presidency, Mr Kennedy benefits from a well-known name. In addition to his father, his uncle Democratic president John F Kennedy was also assassinated during the turbulent 1960s.
Mr Kennedy's appeal to voters from both parties could owe in part to his public positions that align more with the Trump supporters who have embraced anti-vaccination and conspiracy theories than with Mr Biden's centrist and left-leaning base.
Mr Kennedy was banned from YouTube for spreading misinformation about vaccines and the Covid-19 pandemic. The White House, other Democrats and medical professionals said his remarks fuelled antisemitism and racial bias.
Mr Kennedy has also suggested anti-depressants cause school shootings, Wi-Fi radiation causes cancer and that the 2004 election that re-elected George W Bush was stolen, according to FactCheck.org.
