“I understand how strongly so many of my fellow veterans and citizens feel about the flag and I understand the powerful sentiment in state legislatures for such an amendment. I feel the same sense of outrage. But I step back from amending the Constitution to relieve that outrage. The First Amendment exists to insure that freedom of speech and expression applies not just to that with which we agree or disagree, but also that which we find outrageous. I would not amend that great shield of democracy to hammer a few miscreants. The flag will be flying proudly long after they have slunk away.”

New York Times (July 19, 2012)
2010s

Associated Press policy Q&A, "Flag Amendment," Jan 25, 2004.

Alito: Threat to Judicial Independence at Historic High http://www.law.com/jsp/article.jsp?id=1159866330219, by Michael Scholl [2006-10-04].

1990s, Letter to Patrick Leahy (1999)

Describing the people who participated in the Freedom Rides to end segregation in Albany, Georgia. in You Can't Be Neutral on A Moving Train http://www.zmag.org/zmag/articles/oldzinn.htm (1994) Ch. 4: "My Name is Freedom": Albany, Georgia

Declaration of Conscience (1950)
Context: I think that it is high time for the United States Senate and its members to do some soul-searching — for us to weigh our consciences — on the manner in which we are performing our duty to the people of America — on the manner in which we are using or abusing our individual powers and privileges.
I think that it is high time that we remembered that we have sworn to uphold and defend the Constitution. I think that it is high time that we remembered that the Constitution, as amended, speaks not only of the freedom of speech but also of trial by jury instead of trial by accusation.
Whether it be a criminal prosecution in court or a character prosecution in the Senate, there is little practical distinction when the life of a person has been ruined.

1873, Speech on Civil Rights Act (1873)

1990s, Letter to Patrick Leahy (1999)