Hillary Clinton’s campaign released this video:

James Hohmann: “Most politicians respond more to political incentives than principles. That’s the single most important insight to understanding how Washington really works.”

“Every Republican who has bucked Trump can be pretty easily categorized. A clear pattern emerges: the less directly and immediately accountable to Republican base voters an elected official is, the more likely he or she is to break with Trump.”

For members: Why GOPers Won’t Rescind Trump Endorsements

Playbook: “There is increasing concern in news and political circles that Donald Trump will not agree to the three slated presidential debates this fall, a historic break with political norms in the lead-up to the election. The three bouts — organized by the non-partisan Commission on Presidential Debates — are Sept. 26 at Hofstra University in New York, Oct. 9 at Washington University in St. Louis and Oct. 19 in Las Vegas. They are usually wonky and tightly scripted affairs, and offer the next true reset point in the race for the White House.”

“Debate moderators have not been announced, but Republican and Democratic sources, senior media executives and anchors in New York and Washington are casting serious doubt about whether Trump will agree to participate in the primetime events.”

Stuart Rothenberg: “Journalistic neutrality allegedly forces us to say that the race isn’t over until November, and most media organizations prefer to hype the presidential contest to generate viewers and readers rather than explain why a photo finish is unlikely.”

“But a dispassionate examination of the data, combined with a cold-blooded look at the candidates, the campaigns and presidential elections, produces only one possible conclusion: Hillary Clinton will defeat Donald Trump in November, and the margin isn’t likely to be as close as Barack Obama’s victory over Mitt Romney.”

A new NBC News/SurveyMonkey poll shows Hillary Clinton leading Donald Trump in the presidential race by 10 points, 51% to 41%.

“Last week, Clinton’s lead jumped from 1 point to 8 points following her party’s convention, but the real question was whether this bounce would last. The latest tracking poll results indicate that Clinton’s traction over Trump has not slipped.”

Michael Tomasky: “You will also hear them say a kajillion times until Election Day that Florida is a swing state. Well, yes. It has been historically. But the combination of massive demographic changes since 2012 and Trump’s anorexic performance among college-educated whites makes me wonder if Florida is a swing state this year at all. And while the Republicans might nominate a normal candidate in 2020, the state’s demography is galloping away from the GOP.”

“The venues that will host the presidential debates are drawing up plans for a three-person forum that would provide a lectern for a third-party candidate to stand on stage next to Hillary Clinton and Donald Trump,” Politico reports.

“The directive comes from producers working for the Commission on Presidential Debates and it’s meant, they say, to force the university hosts to be prepared and not as a reflection of the state of the race.”

Meanwhile, ABC News reports Clinton agreed to the debate schedule and challenged Trump to do the same.

“A group of 50 former national security officials, all of whom have served Republican presidents from Richard M. Nixon to George W. Bush, have signed an open letter calling Donald Trump unqualified to be president and warning that, if elected, ‘he would be the most reckless President in American history,'” the Washington Post reports.

Sen. Susan Collins (R-ME) writes in the Washington Post that she will not vote for Donald Trump:

“With the passage of time, I have become increasingly dismayed by his constant stream of cruel comments and his inability to admit error or apologize. But it was his attacks directed at people who could not respond on an equal footing — either because they do not share his power or stature or because professional responsibility precluded them from engaging at such a level — that revealed Mr. Trump as unworthy of being our president.”

“My conclusion about Mr. Trump’s unsuitability for office is based on his disregard for the precept of treating others with respect, an idea that should transcend politics. Instead, he opts to mock the vulnerable and inflame prejudices by attacking ethnic and religious minorities. Three incidents in particular have led me to the inescapable conclusion that Mr. Trump lacks the temperament, self-discipline and judgment required to be president.”

John Cassidy: “Given the fundamentals—the state of the economy, the President’s approval ratings, and the fact that the Democrats are seeking to win a third term in the Oval Office—history suggests that this should be a close election. But Trump’s self-destructive antics, coming on top of what was a pretty effective demolition job on him at the Democratic Convention, have, for now at least, taken the pressure off Clinton.”

“While one hesitates to cite Newt Gingrich as an authority on anything other than zoos and his next book contract, there was a good deal of truth in what he said to the Washington Post a few days ago about Trump and Clinton: ‘The current race is which of these two is the more unacceptable, because right now neither of them is acceptable. Trump is helping her to win the election by proving he is more unacceptable than she is.'”

“Theoretically, at least, Trump still has time to reboot, embrace self-discipline, and prepare for the television debates, all the while hoping that another Clinton scandal or a ghastly news event helps him out. But he’ll have to confront a potential mutiny among his fellow-Republicans, a gaping disadvantage in field organization, and the widespread belief that he isn’t qualified to be President.”