Credit: Sam Bermas-Dawes, GPB News Tuesday on Political Rewind: When President-elect Joe Biden is sworn in as the 46th president of the United States tomorrow, he becomes the principal player in a transition marked by a surging pandemic, spiraling joblessness and aggrieved ranks of voters who refuse to believe he was legitimately elected. But previous American presidents have, too, faced daunting circumstances as they took the oath of office, and gone on to build brighter futures for the country. Today, our panel looked at some of the toughest transitions in American history and how new leadership wrestled with great challenges.