In April 2006, "Time" magazine rated Dayton one of America's "Five Worst Senators", calling him "The Blunderer" for such "erratic behavior" as his temporary closure of his office in 2004 because of an unspecified terrorist threat, his complaints about "limited power in a chamber where authority derives from seniority," and his comment in February 2005 that the Mayo Clinic in Rochester, Minnesota was "worth a hell of a lot more than the whole state of South Dakota", a remark he later apologized for. News reports of a Dayton question-and-answer session quoted him giving himself an F grade for his time in the Senate. Largely based on his Washington behavior, "The New Republic" dubbed Dayton's subsequent run for state-level elected office "Eeyore For Governor."