By | July 25 2012 6:01 PM

In an interview Tuesday, rock superstar Elton John told ABC News and Yahoo!'s Power Players that the American president who has done most to spread awareness about HIV is former Commander in Chief George W. Bush. John, a gay AIDS activist since the 1980s, previously described Bush as "the worst thing that ever happened to America" and criticized the president's policies in Iraq and Afghanistan. It's a turnaround that tracks the once-reviled president's comeback in the eyes of the public.