AP Photo/John Locher
The poll, from Morning Consult, found that 72% of respondents view her use of a private email server when she served as secretary of state to be a problem - 48% of whom called a "major" problem. Democrats, too, are nervous about her use of the private server, with roughly one-quarter of respondents dubbing it a major problem.
Last Wednesday, the State Department's inspector general released a report on Clinton's use of a private email account, saying she "did not comply" with department policies.
The report cited "longstanding, systemic weaknesses" related to communications that preceded Clinton's appointment as secretary of state. But the inspector general's report singled out Clinton's failures as more serious.
"At a minimum, Secretary Clinton should have surrendered all emails dealing with department business before leaving government service and, because she did not do so, she did not comply with the Department's policies that were implemented in accordance with the Federal Records Act," the report said.
Voters who responded to the Morning Consult poll also said Clinton should release the transcripts of her paid speeches to Wall Street firms. It's an issue on which Vermont Sen. Bernie Sanders, the insurgent Democratic candidate still challenging Clinton for the nomination, has targeted Clinton along the campaign trail.
Of the poll's respondents, 64% said the Democratic frontrunner should release the transcripts, including 47% of Democrats. Just 19% said she should not release the transcripts.
A majority of respondents also said Sanders, who is facing a near-impossible odds to become the Democratic nominee, should stay in the race.
But, in a general election matchup against Trump, the presumptive Republican nominee, the poll found Clinton held a 42% to 39% advantage over the Manhattan businessman. It was a slight one-point uptick in Clinton's favor compared to a Morning Consult poll released last week.