Two maps published by the stats wizards at Fivethirtyeight depict likely electoral maps if only men or women voted. Women prefer Hillary Clinton; men prefer Donald Trump. In both cases, it's a landslide–and Trump supporters want to see theirs made real. The hashtag #repealthe19th, referring to the Ninteenth Amendment of the U.S. Constitution, was kicked into play to encourage American to turn back the clock women's right to vote.
Eric Trump, the son of the GOP nominee, campaigned using the men-only map, according to Buzzfeed. He presented it and called its existence proof of the "momentum" the Trump campaign has.
Later on, observers noticed #Repealthe19th gaining momentum on Twitter as Trump supporters suggested rolling back the constitutional amendment that gave women the right to vote. Apparently, it isn't a new hashtag, but Silver's predictive map gave it a nudge.
It's not the first time a Trumpkin has headed down this path. Trump delegate Peter Thiel, a Silicon Valley billionaire noted for his successful effort to bankrupt Gawker Media through a series of secretly-funded proxy lawsuits, once wrote that women voting was bad for democracy.