As usual our Communist cousins have their timing all wrong. Just as Castro called it quits in Cuba and Muscovites waxed nostalgic for the Cold War capitalism endured a catastrophic day. Stocks suffered their single worst session of the year amid political gridlock on either side of the Atlantic Ocean one of many bodies of water befouled by BP Plc (BP) and the oil outfit fell 3.42% amid ongoing legal fallout from Deepwater Horizon.   From spills to leaks  Yahoo (YHOO) tumbled 2.31% after the surreptitious disclosure of a memo from Marissa Mayer who wants to ban working from home after being perturbed to look out ...