We shouldn't let the Republicans off the hook. Theodore Roosevelt, we learned from Jeff Cowan's new book, was just as bad as certainly [Louis] Brandeis was, or many Democrats were on the question of segregation.

For [Louis] Brandeis, you know, ethnicity and background are much less important than facts and reason. And he believes that far from wanting to efface our diversity of perspectives, we have to embrace it because that makes us more American, not less. In that sense, he's incredibly modern in an age of cultural pluralism. And it is disappointing for just the reasons you say that not everyone has embraced his pluralistic vision.

[Louis] Brandeis, like [Tomas] Jefferson, is an equal opportunity critic of bigness. And he, like Jefferson, sees American history as this incredible clash between small producers, farmers, and small business people on the one hand, and wicked oligarchs and financiers and monopolists on the other.

What is so inspiring about [Louis] Brandeis's writing is he saw it as a tool for democratic education. He would say things like the opinion is now convincing, now can we make it more instructive, after he'd gone through ten drafts.

I don't think he would have had any trouble answering Justice Sonia Sotomayor's excellent challenge in a case involving GPS surveillance. She said we need an alternative to this whole way of thinking about the privacy now which says that when you give data to a third party, you have no expectations of privacy. And [Louis] Brandeis would have said nonsense, of course you have expectations of privacy because it's intellectual privacy that has to be protected. That's my attempt to channel him on some of those privacy questions.

When I was in law school I was taught that the great writers were people like [Oliver Wendell] Holmes Jr. and [Benjamin N.] Cardozo. But you go back and read their prose and it's sort of perfumed and very ornate and show-offy. And they're constantly striving for these abstractions that seem archaic nowadays.

Louis Brandeis really inspired me to write this book [Louis D. Brandeis: American Prophet]. It was a crazy deadline. The editor said I'd miss the hundredth anniversary unless I pumped the thing out in six months, because I'd been delaying and dilly dallying for so long. So he both inspired me to get up early and write.