Energy shares lead Wall Street higher as earnings get into gear

Wall Street gained on Tuesday, led by surging energy shares that were buttressed by rising oil prices, while Alcoa kicked off an expected tepid corporate earnings season. All 10 S&P sectors were higher in afternoon trading. Energy shares jumped 3 percent, with oil majors Exxon Mobil and Chevron giving two of the biggest boosts to the S&P 500.