 I want him to do whatever he decides to do. And that's the way it is. Whatever he decides, we go with. Joe Biden does have many vocal supporters within the party, including the Democratic leaders in the House and Senate. When he's asked if he has the stamina for another four years in office, he often replies, watch me. And he'll be hoping to demonstrate his vigour as he hosts the NATO summit in Washington, knowing he is being watched very closely. Sarah Smith reporting.