 From NPR News, this is All Things Considered. I'm Juana Summers. And I'm Scott Detrow. After President Biden's poor debate performance, many nervous elected Democrats say they are waiting on more polls and more data before they pass judgment on whether the president should be their nominee. Biden, of course, insists that he is staying in the race regardless, but the polls are playing a key role in how Democrats are seeing things. So how should we interpret them? And what, if anything, are they actually saying right now? And what exactly should we pay attention to?