There are few more prolific Americans than the Harvard scholar, activist and athlete Cass Sunstein. The author of almost 30 books (including the best-selling Nudge) as well as an influential advisor in the Presidencies of Biden and Obama, Sunstein’s new book, On Liberalism, is an unambiguously full throated defense of freedom. Both Reagan and FDR are part of the same big tent liberal family, Sunstein argues, in this defiantly bipartisan reminder of foundations of modern American freedom. There’s not a lot of nudging On Liberalism. He warns that while liberalism faces "severe pressure" today, its core commitments to freedom, pluralism, and the rule of law must unite American citizens across political divides. The alternative, he says, is an unAmerican scenario of unfreedom. In a word: illiberalism.

1. The Liberal "Big Tent" Includes Both Reagan and FDR

Sunstein argues that liberalism isn't just for the left—it's a broad tradition unified by commitments to freedom, pluralism, rule of law, and security (freedom from fear). This tent includes everyone from Margaret Thatcher to Tony Blair, from Ronald Reagan to Franklin Roosevelt, united against illiberal forces like Hitler, Stalin, and Putin.

2. "Experiments in Living" Are Liberalism's Foundation

While just a throwaway line for John Stuart Mill, Sunstein sees "experiments in living" as central to liberalism. Whether it's entrepreneurs trying new businesses, people exploring different religious commitments, or individuals choosing unconventional lifestyles, liberalism protects and celebrates this diversity of human experience.

3. Nudging and Freedom Are Compatible

Sunstein defends his famous "nudge" concept as fundamentally liberal. Like a GPS that suggests routes but lets you choose your destination (or ignore its advice entirely), nudges inform and guide while preserving freedom of choice. Calorie labels nudge but don't coerce; you can still choose the fudge.

4. Liberalism Faces "Severe Pressure" But Isn't Collapsing

While warning that attacks on universities and political opponents are "not consistent with liberal traditions," Sunstein maintains optimism. America's robust liberal foundations—from the Revolutionary War to its cultural commitment to freedom—remain strong, though renewal and vigilance are needed now more than ever.

5. Both Right and Left Harbor Illiberal Tendencies

Sunstein critiques illiberalism across the spectrum: from those who attack political opponents and universities on the right, to the "woke left" that sometimes opposes free speech and seeks to shame rather than persuade. His prescription: a liberalism focused on opportunity and individual agency, free from shaming and open to all.

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