Polling suggests that Hillary Clinton has taken a hit, as controversy continues to swirl around her family's foundation and her use of a private email server while she was America's top diplomat.
But the same survey still found her with a lead over several potential Republican opponents and strong support among fellow Democrats.
The former US Secretary of State, senator and First Lady is the clear front runner in the contest to be the Democratic nominee in next year's US presidential election.
North America correspondent Malcolm Brown reports.
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