What might President Biden's legacy be?

On the eve of President Joe Biden's departure from the White House, we've asked historian Douglas Brinkley for his assessment of our 46th president: 

When President Richard Nixon died in 1994, most Americans thought instantly of one word: Watergate. They didn't think of the EPA, the vital government agency Nixon created. Nor did they think of China, the country he visited as president and strengthened diplomatic ties with. No, the country remembered him, above all, for his foulest political blunder.