With crisscrossing rallies, campaign cash hauls and social media jabs, the 2024 presidential hopefuls made their cases to the American public today. For Vice President Kamala Harris, it was a chance to familiarize voters with her newly minted running mate. Minnesota Gov. Tim Walz. Meantime, former President Trump and JD Vance sharpened their attacks against their opponents. Amna Nawaz reports.