Workers at a Mercedes-Benz plant in Vance, Alabama, voted against unionizing in a major setback for the United Auto Workers (UAW). Autoworkers at the plant voted just 44% in favor of unionizing under the UAW and 56% against, with more than 4,600 votes cast, according to preliminary results released by the union Friday. The loss by the UAW threatens the union’s plan to expand into many of the currently non-unionized auto plants in the U.S., particularly in the South, that have traditionally resisted unionization. Read: The Unfolding Saga Of NIH’s Gain-Of-Function Funding, Disappearing Emails, A…