 Since last month's debate, the White House has been doing damage control, attempting to frame the president's abysmal performances, just a bad night. But concerns about his age and fitness for the presidency are not going away. Elaine Kamark is an expert on how primary politics work. She's a senior fellow at the Brookings Institution in Washington. She's been a superdelegate. She's worked on presidential campaigns. And she's a member of the Democratic National Committee's Rules Committee. We reached her in Brewster, Massachusetts, earlier today.