surges, it looked like they were putting lightning in a bottle. >> they have plateaued. you have the two progressive dynamics, warren and sanders, if you're o'rourke or buttigieg, you look at joe biden. coming up, elizabeth warren's return to an issue that has proven quite problematic in the past. the first person to survive alzheimer's disease is out there. and the alzheimer's association is going to make it happen by funding scientific breakthroughs,