AS THE ELECTION nearing its climax, dozens of polls of American voters are being released every day. Nothing is more eagerly anticipated than the final Des Moines Register/Mediacom poll of Iowa produced by Selzer & Co, a polling firm. On “Election Twitter” – the colloquial name for a community of political data junkies on X – this particular poll has achieved legendary status. On the evening of November 2, Kamala Harris was seen leading Donald Trump in Iowa, sending election Twitter into an uproar. Why?