 Another reason for the group's explosive growth? Exploring D.C. on foot. We just run down the street in popular neighborhoods. It's amazing. Gigi Barnett, WTOP News. And one runner has now run down every single street in the district. Deion Thompson-DeVoli has passed by every porch, every school and restaurant and grocery store in D.C. He started two years ago, and on Friday, he finished his 1,080th...