Screenshot/TwitterWASHINGTON, D.C.—A group of white supremacists stormed through downtown Washington, D.C. on Saturday evening, bearing American flags and mildly menacing plastic shields while marching to the beat of a snare drum down the steps of the Lincoln Memorial. But after chanting aggressively about their plans to “reclaim America,” their intended show of force stalled spectacularly when they lost their ride.While the group had marched through the city with threatening chants about their