As I see it, Hillary Clinton's use of the phrase "basket of deplorables" to describe the different varieties of prejudiced people supporting Donald Trump's campaign was a misstep--even though, in advance, she prefaced it with a mention of generalizations.
Of course, the Trump campaign cut together a rapid response ad; it mixed the victimization tropes that fire up fundamentalist conservatives with footage of the Trump/Pence Louisiana flood photo-op where they briefly pretended to care about people other than themselves.
This reminds me of the self-pity ad made years ago by the Proposition 8 opponents of same-sex marriage featuring Gavin Newsom at another gathering of supporters.
Here's what the site prop8report.lgbtmentoring.org said about the Prop 8 Newsom ad:
The Newsom ad opened and closed with [then] San Francisco Mayor Gavin Newsom saying, “It’s gonna happen—whether you like it or not.” As much as the words, the ad’s raucous and abrasive tone told voters they were not in control and that others were forcing them to accept same-sex marriage.
The more times that conservatives get told they're not in control and (by extension) they're being persecuted, the greater the likelihood of them turning out in force on Election Day.
And this makes it even more vital that the alliance of Clinton believers and pragmatic ex-Sanders followers will not take the next few weeks for granted.
Even if it might mean refraining from basketing bigots existing in the pool of voters/potential voters.