 Ahavuye isanamu, Getty Images Insiguro yisanamu, Barack Obama, wahoze ari perezida wAmerika, akomoka mu ishyaka ryabademokarate Barack Obama - witabiriye ibikorwa byo kwiyamamaza byishyaka ryabademokarate - yavuze ko aya matora ari yo azagena imiterere yigihugu cyacu. 