Hillary Clinton's campaign manager is sounding the alarm over Donald Trump's skyrocketing poll numbers and the "clear and real" possibility Trump will defeat her in the race for the White House.

Robby Mook is warning supporters Trump’s chances of winning the presidency have now risen from 10 percent to as high as 40 percent.

Mook wrote in an email:

In the last week or so, a new polling trend has emerged: Trump's path to the presidency is no longer a pipe dream — it is clear and it is real. TRENDING: 'Greater shakings': Jonathan Cahn foresaw 2020 trouble, warns of even more Trump has more and more ways he can get to 270 electoral votes — that should give all of us pause. Chip in for the first time today to help us stop him and reach our goal of 2.5 million donors by the end of the month — we'll send you a free sticker to say thanks. He has made serious gains in states like New Hampshire and Colorado — places where we once held double-digit advantages. And he's now leading polling averages in several key states, including Florida and Ohio. A month ago, Trump had maybe a 10 or 20 percent chance of winning this election. Today, in most models, his odds have risen to 30 or 40 percent. I realize that some people might have a higher tolerance for risk than others. But a 40 percent chance of Donald Trump in the White House should be too high for anyone. So all of us who care about the future of our country need to commit to do something about it right now. And the best thing you can do? Invest in this campaign so we can keep making our case to anyone who is still undecided in this election. So that we can put more organizers on the ground to register voters who share our values — and make sure they cast their ballots on Election Day: Thank you, Robby Robby Mook

Campaign Manager

Hillary for America

Mook's estimate echoes what a team of political analysts at Citigroup are now saying about Trump’s chances of winning in November.

"We reduce the probability of a Clinton victory to 60 percent from 65 percent, with a 40 percent probability of a Trump win," said the group in a note to clients on Monday.

Citi's team noted Clinton has a "much more mathematically straightforward path to victory” via the Electoral College vote, while highlighting what it described as an "enthusiasm gap" for the Clinton campaign.

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That enthusiasm gap appeared evident just before a scheduled pro-Clinton door-knocking effort in Delaware, Ohio, a middle-class city just north of Columbus.

A self-proclaimed Trump supporter — under the Twitter handle “USA for Trump 2016” — posted a video of what he claimed was the inside of a Clinton campaign office looking more like a ghost town, with only a handful of volunteers present.

BizPacReview captured some of the Twitter responses:

And a photo of a "catatonic" crowd of Temple University students behind Clinton at a rally on Monday elicited similar howls on the Internet.

"So, Hillary Clinton gave a rally today. And only zombies came?" blared the website Twitchy.

"I've seen lines at the DMV with more enthusiasm," snarked one social-media user.

And now even a major leftist media outlet has resorted to piling on Clinton.

The Huffington Post, the publication that boycotted all Trump campaign news, before eventually turning to a strategy of simply trashing him at every turn, just published a political obituary on her flailing campaign, as WND reported.

“If Donald Trump does sack the fortress, no one who lost the battle will want to admit it was Hillary Clinton’s fault,” wrote Howard Fineman, the Post's "global editorial director" and former chief political correspondent for Newsweek.

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“It will have had nothing to do with, say, ‘transparency’ or calling bearded villagers ‘deplorables’ or the Iraq War vote or the simple fact that middle-of-the-road Clintonism ran out of gas as a public philosophy."

A new Reuters/Ipsos poll shows a huge shift toward Trump, with the candidates dead even in the Electoral College vote.

And according to the USC Dornsife/Los Angeles Times Daybreak tracking poll, Trump now leads Clinton nationally by 6 points.