Dear Huan Yi,
My physician has recently informed me of the same thing. He was sharper than Senator Obama because I think he expected me to be at least as willing to learn from experience and past mistakes as I am politically. He expected me to realize weight and blood-pressure and cholesterol and incidence of heart attack and stroke were all connected and to try to correct my eating and exercise habits.
You, Huan Yi, appear to be in fabulous shape, and seem to have taken the lesson to heart in your personal life in ways that I can only, at this point, envy and attempt to emulate. Perhaps it will increase my life span.
How exactly the analogy stretches to national behaviors remains to be seen. But I suspect that Senator Obama may be using this metaphor. It is a frequently used one on the Left, which may be why you aren't familiar with it.
It is, I acknowledge, a flawed metaphor, but one with much to be said for it as well, a mixed blessing, as they say, and one to be used carefully.
If one is to think about metaphors as tools (yet another metaphor, of course), then it's important to select the correct tool for the job. Do you think this metaphor is totally off base, of some use with appropriate care to application, or a panacea. Is there something else that would describe it for you: The cat's pajamas? Rubbish?
Inquiring Bloat Folk wish to know!
Massively yours, BobK.