In the President's defense this is an area in which he has some direct personal knowledge.
George Bush's grandfather, the late US senator Prescott Bush, was a director and shareholder of companies that profited from their involvement with the financial backers of Nazi Germany...
His business dealings, which continued until his company's assets were seized in 1942 under the Trading with the Enemy Act, has led more than 60 years later to a civil action for damages being brought in Germany against the Bush family by two former slave labourers at Auschwitz
From a tactical standpoint I'm quite sure that the Obama campaign is more than willing to engage Mr. 30% in this campaign as much as Bush would like. John McCain on the other hand cannot be happy about a deeply unpopular president with no standing or credibility in the eyes of the American public acting as a surrogate for his campaign. Bush is a fool and all but the dead enders realize this. Being on the receiving end of his flaccid attacks is a positive for Obama and allows his campaign to further tie John McCain to the inept, corrupt and unpopular Bush administration.