"Miers may be at particular risk of being turned into a judicial equivalent of Vice President Dan Quayle. Until his stumbling national debut, Quayle had been regarded as a bright senator from Indiana, but he never fully recovered from the initial blast of mockery." That would certainly be a problem if she planned to run for future office. :)
Unless she's the type of person who is concerned about her legacy, people can mock away without consequence once she has her lifetime appointment.
Jay Leno needs new material anyway.