Democratic presidential candidate Hillary Clinton has 99 problems, and a lack of enthusiasm from her supporters is one of the biggest ones.

Former Pennsylvania Gov. Ed Rendell confirmed as much today during an interview on MSNBC that highlighted Clinton’s eroding support in the Keystone State in recent weeks.

The news station pointed out that Clinton’s lead in Pennsylvania over Republican candidate Donald Trump has been cut in half over the last month, according to Quinnipiac University surveys.

In August, Clinton lead Trump by 10 percentage points – 52 percent to 42 percent – but now holds only a 5 point edge at 48 percent to 43 percent. The numbers show the change comes mostly from those ditching the former first lady’s campaign, rather than a surge by The Donald.

MSNBC quoted a recent story in The Washington Post about Clinton’s “enthusiasm gap” that alleges local community leaders are complaining that “African Americans are lukewarm compared to four and eight years ago.”

“Many supporters of Bernie Sanders … say they might not vote at all,” according to the Post.

“There are 55 days to go and there are going to be a lot of efforts with surrogates, with the secretary herself, with vice presidential candidate Kaine, they’re going to come here,” the former Democratic governor said.

“I think there is an enthusiasm gap, but I don’t think it’s a great gap, number one,” he continued. “I think people are going to turn out because they’re afraid about what Donald Trump is talking about. …

“So people are afraid of Donald Trump, they’re going to get out and vote.”

Rendell also believes that Clinton has a better ground game than Trump, which will “counterbalance” the lack of enthusiasm for the Democratic Party’s troubled candidate.

“The enthusiasm gap is counterbalanced a little bit … by the turnout organizations,” Rendell said. “There is no sign of any Trump turnout organization in Pennsylvania. The Clinton people have an incredibly well-organized turnout operation, so that will counterbalance the … enthusiasm gap and maybe tip the scales a little bit towards Hillary Clinton.”

He also offered his insight into why Clinton is now losing ground to Trump in most national polls.

“She’s struggling because we always knew that the race would get tighter, it’s a polarized electorate, we’re really talking about a swing voter pool of 15 percent,” he said. “I think Hillary Clinton will win that pool. She’s winning … in the Philadelphia suburbs. She’s winning by margins that far exceed what President Obama did in 2012, so she’s going to win that pool.

“And then it’s a turnout battle and I think the organization that the Clinton folks have on the ground will turn out voters as well if not better than the Trump organization,” he continued. “And remember, Pennsylvania now has 919,000 more registered Democrats than Republicans.”

Rendell’s confirmation of Clinton’s enthusiasm problem with voters is something Democrat thinkers have repeatedly pointed out throughout her campaign.

Democratic consultant Paul Begala told CNN as far back as February that the problem has made for some restless nights.

“In past primaries and Democratic caucuses, the turnout has not been more than it has been, say in 2008. But on the Republican side, it does seem voter turnout is elevated,” host Anderson Cooper told Begala.

“Is there more enthusiasm on the Republican side?”

“There is,” Begala responded, “and that keeps me up at night.”

“It does…” Cooper said, confirming his startling answer.

“Oh, man,” Begala said, shaking his head. “We’re not on the air…” he added as the panelists laughed.

“The enthusiasm gap is really serious. I saw a survey a few weeks ago. Seventy-one percent of conservatives say they’re excited about this election. Seventy one!” he continued.

“Only 40% of Millennials — a heart, one big part of the Democratic base. So there’s a 30-point gap between my party’s best voters and Republicans’ best voters.”