This is not a new campaign strategy and has been going on for years and like it or not you can bet your ass that Romney is going to use every opporunity to point this out. This is an election year and the presidency is at stake, thick skin is required. http://voices.washingtonpost.com/fact-c ... _tour.html
While I see the outrage over Romney's "attack" on Obama here but I don't recall reading anything about Obama's offering to apologize to Japan for ending World War II and having the Japanes turn him down a few years back. http://abcnews.go.com/blogs/politics/20 ... hiroshima/
In September 2009, US Ambassador to Japan John Roos reported to the Obama administration that the Japanese government did not think it was a good idea for President Obama to visit Hiroshima to apologize for the US having dropped an atomic bomb on that city, a secret cable published by Wikileaks revealed.
Roos wrote the cable after his August meeting with Vice Foreign Minister Mitoji Yabunaka, reporting to Secretary of State Hillary Clinton that the Japanese government felt “the idea of President Obama visiting Hiroshima to apologize for the atomic bombing during World War II is a ‘non-starter.’ 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.”
Too much time has passed and most of the WWII Veterans are gone now so I guess it doesn't matter that Obama wanted to apologize to the nation that perpetrated a "Date which will live in Infamy" but its still a despicable thought to even entertain, never mind have it turned down.