(2019), Sunstein addressed the possibility of a shared American narrative. He cited the concepts of self-government and equal dignity of human beings, but focused in particular on stories: "an emphasis on what happened before and after the firing shots in Concord and the courageous response of the embattled farmers maintains continuity with the historical facts and offers us something on which we can build." Sunstein is a contributing editor to The New Republic and The American Prospect and is a frequent witness before congressional committees. He played an active role in opposing the impeachment of Bill Clinton in 1998. In recent years, Sunstein has been a guest writer on The Volokh Conspiracy blog as well as the blogs of law professors Lawrence Lessig (Harvard) and Jack Balkin (Yale). He is considered so prolific a writer that in 2007, an article in the legal publication The Green Bag coined the concept of a "Sunstein number" reflecting degrees of separation between various legal authors and Sunstein, paralleling the Erdős numbers sometimes assigned to mathematician authors. He is a member of the American Academy of Arts and Sciences (elected 1992), the American Law Institute (since 1990), and the American Philosophical Society (elected 2010). He received an Honorary Doctorate from Copenhagen Business School. In February 2020, he wrote an article for Bloomberg titled "The Cognitive Bias That Makes Us Panic About Coronavirus". In it he claimed that "A lot more people are more scared than they have any reason to be" and that "Most people in North America and Europe do not need to worry much about the risk of contracting the disease. That's true even for people who are traveling to nations such as Italy that have seen outbreaks of the disease." He attributed the excessive perceived risk to probability neglect. At time of publication, there have been 68 confirmed COVID-19 cases in the U.S., including one death, and approximately 1000 new daily cases worldwide, over 300 of which in Europe. Sunstein joined the Department of Homeland Security in February 2021 as an advisor to the Biden Administration on immigration policy. Together with Daniel Kahneman and Olivier Sibony, Sunstein co-authored Noise: A Flaw in Human Judgment, which was published in May 2021. Drawing not least upon legal examples, it treats of unwanted variability in human judgments of the same problem, for instance when court judges recommend vastly different sentences for the same crimes.