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Democratic presidential candidate former Vice President Joe Biden speaks during the fourth day of the Democratic National Convention, Thursday, Aug. 20, 2020, at the Chase Center in Wilmington, Del. President Donald Trump and Democratic challenger Joe Biden are entering a 64-day sprint to the finish that is widely expected to be one of the most turbulent and chaotic periods in the modern history of American politics. Each side cast the other as an existential threat to AmericaâÄ™s future as they offered voters starkly different versions of reality over the last two weeks of carefully scripted conventions. (AP Photo/Andrew Harnik)