The Department of Justice decided against prosecuting Clinton, but FBI Director James Comey publicly criticized her for being "extremely careless". But the political damage had been done.

Bernie Sanders outlined the qualities he'd like to see in Hillary Clinton's vice presidential pick during an interview on Wednesday, telling NBC's "Today" show host Matt Lauer that he "would like to see the most progressive person possible".

"It's good for Clinton that Sanders endorsed her because 15 percent of his voters had angrily announced that they are #NeverHillary, so this should peal a few of them off and into her camp", he pointed out.

According to Quinnipiac, Florida voters really do seem to care about Clinton's ongoing email scandal. In the swing state of Ohio, Trump and Clinton are tied with 41 percent of support each.

The two candidates tie on who is better described as being "honest and trustworthy" (32 percent apiece).

In the week before the Dallas shootings became national news, Clinton focused her speeches on tearing down Donald Trump's economic populism and attacking his business record.

In a matchup including Libertarian Party nominee Gary JohnsonGary JohnsonPoll: Clinton holds 3-point lead over Trump nationally New poll shows Trump leading Clinton in key swing states The Trail 2016: Unity at last MORE and the Green Party's Jill Stein, Clinton has a slightly larger lead.

After the Quinnipiac poll release, Clinton press secretary Brian Fallon wrote on Twitter that the campaign expects swing states to be tight.

"I know that just saying these things together may upset some people", Clinton said. What we need is a Left that not only begins from a strong position, but has the discipline and fortitude to play ball when the time comes for it. "Trump is a serious danger, folks".

Virginia voters are twice as likely to say the phrase "has the right temperament to serve effectively as president", applies to Clinton (54 percent) than Trump (27 percent). Last month, Trump led in that same measure by only 43-40 percent.

Clinton has also lost ground among no-party-affiliation voters in Florida.

Both candidates still have remarkably high unfavorables: 64 percent viewed Trump in a negative light, and Clinton earned 60 percent in the same metric.

Iowa has traditionally been a battleground state in presidential elections, and with the exception of a poll in June that said Clinton led Trump by double digits, the other more recent surveys in the state have portrayed a close contest. "Although he is winning among white voters, who are mainly Republican, victory in Florida will be a very hard lift for him if he can't do better among non-white voters".

Trump's lead in the head-to-head matchup is within the poll's 3.1 percentage-point margin of error.

Clinton cited Trump's toying with "creating a database to track Muslims in America", his provocative statements about women and work during Obama's presidency to promote the "birther movement" which sought evidence that the one-time IL senator was not born in the United States.