At the Democratic National Convention, Kamala Harris is set to formally accept her party's nomination for president, aiming to present an optimistic vision in contrast to Donald Trump's agenda. Barack Obama's viral joke about Trump's obsession with crowd sizes and Harris's rising poll numbers among key demographics underscore the party's efforts to energize their base while appealing to swing voters. Gov. Maura Healey and other prominent Democrats such as Gov. Tim Walz and Suzan DelBene have rallied behind Harris, emphasizing her leadership and the stark choice voters face in the upcoming election. Meanwhile, Trump has responded to the criticisms from the Obamas with personal attacks, highlighting the ongoing contentious atmosphere of the race. Harris's speech is expected to focus on her background, her vision for America, and a critique of Trump's policies.