It's the most high-profile public appearance that a chief justice makes. And John Roberts blew his lines, in front of a massive worldwide audience.
Today, he and President Obama repeated the presidential oath of office, so as to avoid any questions about the validity of the presidential inauguration. That was similar to Calvin Coolidge's second oath, that I described here.
What I want to know is: how can Roberts call himself a strict constructionist, if he's going to ad lib an oath that appears, word for word, in the Constitution?