Photo by Downing87 Nurses at the Washington Hospital Center voted Wednesday to hold a one-day strike in early March to protest staffing and wage cuts amidst lagging contract negotiations. The National Nurses United union, which represents the approximately 1,600 nurses at WHC, has been at loggerheads with the hospital over contract issues since last year. Threats of a strike aren’t new to the hospital. Last November, the nurses union threatened another one-day strike on…