Dr. Stephen J. Farnsworth, a professor of political science and international affairs at the University of Mary Washington in Virginia, said the data shows how much “every vote counts.” “When presidential elections come down to several thousand votes in a handful of key swing states, every vote really does count,” he told Newsweek. “While Americans abroad are not a huge voting bloc, these narrow-margin elections of recent years mean that they could be a decisive voting group in a few closely contested states.”

