Wall Street extends gains after strong GDP data

"Today's GDP data shows that the U.S. economy's fundamentals are strong and are growing despite all the global headwinds," said Brad McMillan, chief investment officer for Commonwealth Financial in Waltham, Massachusetts. The market surged on Wednesday after New York Fed President William Dudley said the case for a September rate hike seemed "less compelling" after recent market volatility due fears of slowing growth in China. The U.S. Federal Reserve, which meets on Sept. 16-17, has said it wil