Vice President Kamala Harris and former President Donald Trump are set to face off in their first presidential debate on September 10, with Harris replacing Biden on the Democratic ticket after his withdrawal. Polling shows a tight race, with Harris holding a slight edge nationally but facing challenges in key battleground states. Harris has surged in favorability since becoming the nominee, although recent polls indicate a shift in momentum towards Trump. Both candidates are preparing for the debate differently, with Harris engaging in detailed mock sessions and Trump focusing on his policy record. The debate is expected to be a pivotal moment for both campaigns, drawing significant voter attention to their policies and personal traits.