The Note: Trump Campaign Enters Debate Day in Crisis Mode

— -- NOTABLES

--5 STORYLINES TO WATCH AT TONIGHT’S PRESIDENTIAL DEBATE: The second presidential debate caps off a news-filled week on the campaign trail and expectations are high that tonight will be quite a showdown between Hillary Clinton and Donald Trump. The two candidates will meet for a town-hall style debate with a select group of undecided voters, some of whom are slated to directly ask the candidates questions. The the television audience for the event is expected to be very big given this week’s news events. ABC’s MEGHAN KENEALLY notes five of the most important storylines to watch when tuning in at 9 p.m: How Trump Explains Himself, Practice Potentially Paying Off, Completing the Tickets, Connecting With Voters and The Role of the Moderators. http://abcn.ws/2dG3dST

RAPID RESPONSE POLL: 43 PERCENT OF AMERICANS SAY TRUMP SHOULD WITHDRAW FROM RACE: More than 40 percent of Americans say Donald Trump should drop out of the presidential race following the release of a video of the GOP nominee making lewd comments about women in 2005. ABC News together with our partners at SSRS survey research firm conducted a rapid response poll, asking whether Trump should withdraw as the Republican nominee for president. Forty-three percent said he should, while 57 percent said he should stay in the race. As to the effect of the video of Trump's vulgar comments on their vote, 53 percent said they are now less likely to cast a ballot for Trump, and 46 percent said the recording of the nominee's remarks will make no difference in their decision. Two percent said the video makes them more likely to vote for him, ABC’s RACHEL TILLMAN reports. There was a stark gender gap, with 62 percent of women less likely to vote for him while 55 percent of men say it will make no difference on their vote. http://abcn.ws/2dL8uYK

WHAT WE’RE READING -- CLINTON GAINS DOUBLE-DIGIT LEAD OVER TRUMP IN PENNSYLVANIA: Hillary Clinton has developed a double-digit lead over Donald Trump in the battleground state of Pennsylvania, according to new NBC/WSJ/Marist polling released Sunday. This polling was conducted before Friday when audio was released featuring Trump making lewd comments about women and discussing his attempt to have an affair with a married woman. In Pennsylvania, Clinton holds 49 percent compared to Trump’s 37 percent, ABC’s CATHERINE THORBECKE writes. This is a larger than usual lead for Clinton in that battleground state. Meanwhile, Gary Johnson of the Libertarian party trails behind with six percent and the Green Party's Jill Stein is even further back with four percent. In a two-way contest, Clinton's advantage over Trump would be 12 points, at 51 percent to 39 percent. http://abcn.ws/2dDQ7oW

IN CASE YOU MISSED IT -- ‘SATURDAY NIGHT LIVE’ TAKES AIM AT TRUMP’S HOT MIC SCANDAL: Donald Trump continues to provide “Saturday Night Live” with fodder. Alec Baldwin reprised his role as Donald Trump last night, while "SNL" regular Kate McKinnon returned as Hillary Clinton, ABC’s DAVID CAPLAN writes. http://abcn.ws/2efIQOG

WHO’S TWEETING?

@WSJ: What Trump and Clinton need to do at tonight’s #debate, one of the largest stages of the entire campaign. http://on.wsj.com/2dDVjcF

@RobertZepeda: Big Night | 7 Things You Should Know About Presidential Debate Moderator Martha Raddatz http://www.esquire.com/news-politics/a49360/martha-raddatz-presidential-debate-moderator/

@samsteinhp: Trump’s belief that apologizing is a form of weakness is exactly backwards.

@rubycramer: .@HillaryClinton’s deep, abiding, “obsessive” love of research, being “humongously prepared” -- and oppo https://www.buzzfeed.com/rubycramer/hillary-clinton-already-knows-the-bad-thing-you-said?utm_term=.ivgeo4XJP3#.lx7olD1BLb

@chrislhays: It is so revealing all these Republicans saying "I have a wife & daughter & mother" You don't know any Muslims? Any Mexican immigrants?