In a desperate attempt to scare away suburban women from keeping an open mind about Trump, Team Hillary decided to set up a guilt by association between Trump voters and mean racist trolls on the internet, whom she calls the alt-right.
Every suburban woman's natural reaction is -- "The alt-who?"
So, her writers had to explain who they were, both the names of people and websites, along with the ideas they hold.
This fails as fear-mongering because it's supposed to elicit a gut reflex response of disgust, anxiety, shame, etc. But people cannot have a gut-level intuition about something that is entirely unfamiliar to them, and that needs to be explained and taught to the audience. Intuitions only form after extensive experience.
We all know who the televangelist type is, so the Democrats could fear-monger about that type against Ted Cruz. But the alt-right? It's too new, under-the-radar, and unfamiliar for normies to have any gut-level impression of -- positive, negative, or otherwise.
Trying to didactically explain who the alt-right boogeyman is, engages contradictory lobes of the brain -- the conscious, rational, and analytical (learning who this group is), and the unconscious, intuitive, and emotional (fear of boogeymen reflex).
Not to mention the fact that suburban women don't like learning new stuff in general, especially when it's unsolicited lecturing rather than something they're curiously exploring, and delivered in that scolding schoolmarm tone of voice that reminds them of every bitch of a teacher they've ever had.
I think the whole stunt was just the vindictive butthurt homos who staff Hillary's campaign looking for a public way to lash out at their online tormentors, and whether it affected her polling at all was more of an afterthought.
If this non-event is any guide, we won't have to be playing much defense for the remainder of the race.