The global coronavirus outbreak might accomplish something that myriad bad polls haven’t: make Republicans fear losing the 2020 presidential election. Until now, survey after survey has consistently shown President Trump losing to the Democrats in November. Like, to all of the Democrats. Yet Republicans have remained confident…But the plunging stock market, badly spooked by the unpredictable spread and impact of the virus, is suggesting the tailwind might turn into a headwind — and that could mean a one-term Trump presidency.