Is corpulence really a disqualification for the presidency in the land of supersized fries? If so, that's a shame. America might do better with a fat president. After all, some of our best have been big fellows, and lately the trim and ambitious types haven't served us so well. "Yon Cassius has a lean and hungry look; he thinks too much. Such men are dangerous," Shakespeare's Julius Caesar comments to Marc Antony. "Let me have men about me that are fat ... such as sleep...