Not a lot that you haven't heard before but some reasons (or at least how he articulated them) that stand out
among other things our major problems are likely to be with us for decades—and cannot primarily be dealt with by aircraft carrier superiority, a tough thing for a true blue Navy man to admit. I believe Mr Obama meets the Churchillian standard of "jaw jaw beats war war." I am fearful of Mr McCain's bellicosity and perhaps some volatility.
Though I am an avowed supporter of undiluted capitalism (my faith, like Mr Greenspan's, is being sorely tested), I believe that the growing inequity in America is a clear and present danger of the first order. As Mr Buffett said, and I paraphrase, "There's a problem when my secretary has a higher marginal tax rate than I do."
I think the time has come to pass the torch to the next generation, and I believe Mr Obama would be an excellent symbol of a new generation of leader. (I think Mr McCain has the haggard look of yesterday, and is, like myself, advertised to be a cranky old man. Age matters—take it from me, and feel free to wish me "happy 66th" on 7 November.)