An article on Saturday about fund-raising efforts in New York by Senator Barack Obama misspelled the surname of one of President John F. Kennedy’s closest advisers, who introduced Mr. Obama at a fund-raiser. He is Theodore C. Sorensen, not Sorenson. (Go to Article) The error also appeared in an article in The Arts on Feb. 22 about books written by candidates, including “Profiles in Courage,” which then-Senator Kennedy wrote with guidance from Mr. Sorensen. (The Times has misspelled Mr. Sorensen’s surname more than 135 times in headlines and articles during the 50-plus years he has been a Democratic adviser and well-known author.) Link