This is what we call "bipartisanship." No, this isn't the Republican definition, upon where Democrats are simply to cave in to Republican demands, but one where Bono used his appeal to go beyond party lines. I really doubt that Bono supports most of the Bush platform, but he's not American. All he was concerned with was debt relief, and he used diplomacy on what could have been an otherwise hostile president. I think Bono has learned in age that change is best achieved working through the existing system, rather than just bucking the system, which was the preferred choice of U2 in the 1980s.
In other words, Bono is being nice to Bush only because he has something that he wants (debt relief) and cannot get without Bush's approval.
Melon
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"He had lived through an age when men and women with energy and ruthlessness but without much ability or persistence excelled. And even though most of them had gone under, their ignorance had confused Roy, making him wonder whether the things he had striven to learn, and thought of as 'culture,' were irrelevant. Everything was supposed to be the same: commercials, Beethoven's late quartets, pop records, shopfronts, Freud, multi-coloured hair. Greatness, comparison, value, depth: gone, gone, gone. Anything could give some pleasure; he saw that. But not everything provided the sustenance of a deeper understanding." - Hanif Kureishi, Love in a Blue Time