Wall St notches fourth straight advance as energy gains

Wall Street gained for a fourth straight session on Tuesday, its longest winning streak since January, buoyed by the energy sector as oil prices rebounded from early declines. Oil prices were initially lower on concerns a deal between Iran and six global powers would result in more supply, but turned higher after it became apparent sanctions on Tehran's crude exports would not be removed immediately. "The big news is clearly in the oil markets and the fact there was an agreement reache