"We're not going to give this a guy an excuse about a book he might have read or a movie he watched or a song he listened to or a symbol out anywhere. It's him...not the flag," the Republican senator told CNN's "New Day" Alisyn Camerota, One of the common photos of Roof circulated in the media is one of him seen posing by a car featuring a South Carolina license plate depicting the Confederate flag. Watch Obama react...