FILE - In this Oct. 4, 2009 file photo, U.S. Ambassador to Japan John Roos, center, and Hiroshima Mayor Tadatoshi Akiba, left, pray for the victims of the atomic bombing at the Memorial Cenotaph for A-Bomb Victims at Peace Memorial Park in Hiroshima, western Japan. Hopes are growing in Japan that Barack Obama will become the first sitting U.S. president to visit Hiroshima or Nagasaki, the only two cities ever devastated by atomic bombs. A woman at right is unidentified.