Almost no one thought Joe Biden could make it back to the White House - not Donald Trump, not the two dozen Democratic rivals who sought to take down a weak front-runner, not the mega-donors and key endorsers who feared he could not beat Bernie Sanders, not even Barack Obama. The story of Biden's cathartic victory in the 2020 election is the story of a Democratic Party at odds with itself, torn between the single-minded goal of removing Donald Trump and the push for a bold progressive agenda that threatened to alienate as many voters as it drew.