No, Mr. President, you don't eat the hot towel. The very first state dinner that the already departed social secretary Desiree Rogers threw at the Obama White House was for Manmohan Singh, India's prime minister, not to be confused with the gatecrashing Salahis, who attended anyway and have been milking their infamy ever since. State dinners aside, the Obamas have roiled the Washington social set with their new rules prohibiting mingling and a reception line. But in New Delhi, Singh returned the favor for the Obamas on Monday night, sitting on the American president's right while India's president, Pratibha Patil,...