But Japan declined.
From The Japan Times, via Steve Hayward:
The cable, dated Sept. 3, 2009, and sent to U.S. State Secretary Hillary Clinton, reported Japan’s then Vice Foreign Minister Mitoji Yabunaka telling Ambassador John Roos on Aug. 28 that antinuclear groups would speculate over whether the president would visit Hiroshima in light of his Prague speech on nuclear nonproliferation.
“He underscored, however, that both governments must temper the public’s expectations on such issues, as the idea of President Obama visiting Hiroshima to apologize for the atomic bombing during World War II is a ‘non-starter’,” said the cable.
It also quoted Yabunaka as saying, “While a simple visit to Hiroshima without fanfare is sufficiently symbolic to convey the right message, it is premature to include such program in the November visit.”“Yabunaka recommended that the visit in November center mostly in Tokyo,” it said.