Barack Obama came, he spoke, and no one concurred: India and China have taken a united stand and walked out of the climate summit as Copenhagen talks fail.Tensions prevailed at the climate talks at Copenhagen today, as Indian prime minister Manmohan Singh and China premier Wen Jiabao walked out of the summit along with their respective delegations, as talks failed. Obama feted Singh just this month, saying that they should be impressed that India got first crack at Obama’s state dinner agenda. Apparently, Singh was less impressed than Obama presumed.Meanwhile, Obama is getting some pretty bad reviews for his intervention...