 And there's usually a period of volatility in the days after a major political event. As a rule of thumb, pollsters talk about waiting maybe two weeks or so for public opinion to settle down. It might be different in this election because of how hyper-polarized the environment is and people being very dug in that we might not see much change. Here's Lee Meringoff, director of the Marist Institute for Public Opinion, which conducts polling for NPR. There's not been a lot of movement because you have two factors, Biden's age and Trump's not telling the truth.