Retired U.S. Supreme Court Justice John Paul Stevens arrived for a speaking engagement in Miami with a ruddy face and ready smile. He had been swimming in the ocean that morning, he said. At age 93, Stevens is still going strong — not only his physical condition, but in his opinions as well.

Asked at one point during his appearance whether it would take a constitutional amendment to counteract the effects of the 2010 Citizens United decision on campaign finance, Stevens shot back, “Either a constitutional amendment or one more vote.” Stevens wrote a forceful dissent in the 5-4 ruling.