 about his fitness for office just months before the election. Vice President Kamala Harris is the leading candidate to succeed Biden as the presumptive Democratic nominee and her party's main hope of defeating Donald Trump. The president, intent on serving out the remainder of his term, quickly endorsed Harris to take on Trump and encouraged his party to unite, making her the party's instant favorite for the nomination at its August convention in Chicago. She immediately received the backing of influential Democrats, including Senator Elizabeth Warren.