Hour. tamron? >> thank you very much, craig melvin. coming up, will joe biden really run for president? the two stories out today that gives our team doubts about his presidential plans. we'll talk with senior political editor mark murray about that. plus this -- >> right now i'm just going to do what i've got to do. >> oh, no! oh, no! john sena gives jon stewart an attitude adjustment. how this even happened. it was pretty comical. later, call your family, call your friends, go to instagram, go to twitter. guess who is joining us? the lead of matchbox 20, rob thomas. he joins us live. h...