The so-called Potomac primary completed his winning streak: he won Virginia by 29 points, Maryland by 23 points, and the District of Columbia by the minor matter of 51 points.

• 所谓的波托马河流域初选成就了奥巴马的一连串胜利：他以超过对手29%25的得票率在弗吉尼亚获胜，在马里兰州时这个比例为23%25，在哥伦比亚特区则是轻松的达到了51%25。