Hillary Clinton's biggest problem isn't going away yet

Hillary Clinton
Hillary Clinton

(AP)
Hillary Clinton.

It took all of 36 hours for the next shoe to drop in the ongoing saga of Hillary Clinton's personal email server.

The Wall Street Journal reported on Thursday about technical problems on her server that seemed to occur somewhat routinely.

Later Thursday evening, Fox News reported that an FBI investigation into the matter is focusing on a "gross negligence" provision of the Espionage Act.

And on Friday the FBI — which is investigating the former secretary of state's email server — pushed back against President Barack Obama's suggestion that Clinton simply made a "mistake" and had already atoned for it.

The latest wave of reports remind Clinton and her campaign that the biggest thorn in its side — the one that caused headaches for the campaign all summer — probably isn't going to simply go away, despite a triumphant moment for the former secretary of state earlier in the week.

'Thank you, Bernie'

During the first Democratic debate of the campaign season, to which more than 15 million people tuned in, Clinton's chief current rival for the Democratic nomination, progressive insurgent Sen. Bernie Sanders (I-Vermont), was handed on a platter a chance to bash her over her use of a private email server while at the State Department.

Instead, he offered backup — in theatrical fashion.

"Let me say something that may not be great politics. But I think that the secretary is right. The American people are sick and tired of hearing about your damn emails!" Sanders said, as the audience roared.

"Me too, me too," Clinton said, smiling.

"Enough of the emails — let's talk about the real issues facing America!" Sanders boomed.

"Thank you, Bernie," Clinton said. The pair shook hands.

That defense may play well with Democrats, many of whom are sick and tired of hearing about Clinton's emails — and at least partly because the saga has disrupted her standing as the overwhelming Democratic front-runner.

In fact, Sanders is betting it plays well with Democrats. His campaign sent out a fundraising email off the comments during the debate. He touted them Thursday on "The Ellen DeGeneres Show." His campaign said it raised more than $2 million in post-debate funds by Thursday.

But it's a much different story with the rest of the country, polls show.

Hillary Clinton Bernie Sanders
Hillary Clinton Bernie Sanders

(AP)
Hillary Clinton and Bernie Sanders.

'It's not just going to go, "Poof"'

According to a Washington Post/ABC poll from September, registered voters are evenly split — 48-48 — on whether the Clinton email story is a "legitimate" campaign issue.

Breaking the numbers down further suggests that while Democrats are indeed tired of the issue, its lingering presence could complicate a potential general-election contest for Clinton. By more than 50 points each, Democrats and Republicans differ on whether the issue is "legitimate." Independents are split, with a narrow plurality saying it is legitimate.