 As to how the president could reassure voters, Senator Chris Murphy of Connecticut tells CNN's State of the Union. He's got to go out there this week and show the American public that he is still that Joe Biden that they have come to know and love. I take him at his word. I believe that he can do it. But I think that this is a really critical week. I do think the clock is ticking. Several major events this week, including the NATO meeting in Washington. Ukraine will be a major topic, says ABC's Perry Russom.