 In 2012 county voters again supported Obama, who took 51.5% of the vote, with Republican challenger Mitt Romney garnering 47%.Democrats carried the county again in the 2016 presidential election, when Loudoun swung heavily towards Hillary Clinton, giving her 55.1% to Trump's 38.2%.Like many counties in Virginia, Loudoun is locally governed by a board of supervisors, the Loudoun County Board of Supervisors.