Hillary Clinton falters in new national poll
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Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonJill Stein: 'I am not a Russian spy' Trump criticizes Clinton for suggesting Jill Stein was Russian asset Graham: I'm seeking to make Trump successful 'but not at all costs' MORE is faltering in her bid for the 2016 Democratic presidential nomination, a new national poll of Democratic-leaning voters shows.

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Clinton's support has fallen 21 points since July, from 63 to 42 percent, according to a Washington Post/ABC News poll released Monday, dropping below 50 percent for the first time.

Support for Clinton has particularly eroded among women, an integral demographic for her campaign, falling from 71 percent two months ago to 42 percent now.

Sen. Bernie SandersBernie SandersOcasio-Cortez: Sanders' heart attack was a 'gut check' moment Ocasio-Cortez tweets endorsement of Sanders Ocasio-Cortez throws support to Sanders at Queens rally MORE (I-Vt.), who gained 10 percentage points since July, now stands at 24 percent support in the poll, while Vice President Biden has gained 9 points amid increasing interest in a potential White House bid, putting him at 21 percent now.

Should Biden opt not to run, Clinton leads Sanders, 56 percent to 28 percent.

A majority of Americans, 55 percent, said they disapproved of the way Clinton has handled questions about her use of private email while serving as secretary of State. That includes a third of Democrats, 58 percent of independents and 83 percent of Republicans.

Fifty-one percent of Americans think Clinton broke government rules regarding private email, while nearly a third, 32 percent, say she didn't. Nearly half of Americans, 49 percent, don't consider her use of private email as a legitimate issue, while 44 percent do.

The Washington Post/ABC News survey of 1,003 U.S. adults and 821 registered voters was conducted Sept. 7-10 via landlines and cellphones with an overall margin of error of 3.5 points.

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