With the pick of Tim Walz, the 2024 matchup is set and shaping up to be another razor-thin election. A new PBS News/NPR/Marist poll shows Kamala Harris with a three-point lead over Donald Trump nationally, within the poll's margin of error. For more about where the presidential race stands, Amna Nawaz and Geoff Bennett spoke with Domenico Montanaro of NPR.