Last week began with Donald Trump sniffling and raging at Hillary Clinton during their first presidential debate. It ended with the shocking revelation that Trump lost nearly one billion dollars in the mid 1990s and may have used his massive business failure to avoid paying federal income taxes for 18 years. In between were bizarre 3 a.m. tweets about sex tapes, revelations that he had made a fully-clothed cameo in a soft-core adult movie, and a report that he may have illegally violated the Cuba embargo. Now, after what was perhaps the worst week in presidential politics in modern history, the Trump campaign is feeling the effect.

A wave of new polls Monday show Clinton taking a decisive lead nationally, arresting a slow, post-convention slide in the weeks leading up to the first debate. Prior to Trump’s debate stage debacle (and his subsequent week-long meltdown), Clinton allies were fretting that her pneumonia scare, a spate of negative headlines, and Trump’s relative discipline could permanently change the momentum of the race. But never underestimate Donald Trump’s ability to ruin a good thing.

The latest CNN/ORC gives Clinton leading Trump 47-42 in a four-way race—a huge turnaround from September, when CNN found Trump leading 45-43. The network’s pollsters attribute the change to an “enthusiasm shift” in the electorate, with 50 percent of likely voters excited to vote for Clinton (compared to 46 percent previously), while the same enthusiasm for Trump slipped from 58 to 56 percent. Respondents in the latest poll also said Clinton won the first presidential debate by a 2-to-1 margin.

Morning Consult similarly gives Clinton a 6-point lead in a four-way race, 42-36—a three point improvement for the Democratic nominee over the last Morning Consult poll, taken immediately after the debate. CBS News, meanwhile, places Clinton 4 points ahead of Trump, 45-41 in a four-way race, whereas the last CBS survey in early September found them tied, 42 to 42.

And that’s just nationwide: The latest polls show Clinton improving in key battleground states, too. A Quinnipiac poll released Monday shows Clinton taking a 5-point lead over Trump in Florida, a 3-point lead in North Carolina, and a 4-point lead in Pennsylvania. Another poll in North Carolina shows her eking out a lead in the Tarheel State, where Trump previously had been polling ahead prior to the debate. In Florida, which is a must-win state for Trump (FiveThirtyEight gives the Republican only a 5 percent chance of winning the election if he loses there), Clinton is now ahead by 46-41 according to Quinnipiac.

Colorado, which was once considered a swing state, is now looking like solid Clinton territory, too. The former secretary of state saw a whopping 11 point bounce in Colorado after the debate, bringing her lead over Trump to 49-38 in a four-way race. “Some polls had suggested that Colorado was becoming more competitive. That may have been true last month, but it does not appear to be the case now,” said Monmouth University, which conducted the poll, in a statement.

The best news for Clinton, however, is that she stands to gain more millennial and independent voters as Libertarian candidate Gary Johnson, who currently has a hold on roughly a third of the youth vote, loses support. Amid weeks of befuddled interviews (“What is Aleppo?” Johnson asked during one), including one in which he couldn’t remember the names of any world leaders, voters appear to be abandoning the former New Mexico governor. Four-way polls show Johnson dropping from the high single digits to the low single digits, but the damage is more drastic in battleground states:

Even, Libertarian elder statesman Rep. Ron Paul said that he was “disappointed” in Johnson, hinting that he was going to vote for Jill Stein instead. The likelihood that fleeing Johnson supporters will go Green, however, seems low.