By Caroline Valetkevitch NEW YORK (Reuters) – U.S. stocks rallied on Wednesday, led by Nasdaq after the Federal Reserve raised its benchmark overnight interest rate by three-quarters of a percentage point and comments by Fed Chairman Jerome Powell reassured investors. The news added to gains from upbeat quarterly reports from Microsoft Corp and Alphabet Inc that lifted sentiment about the earnings season. Powell said in a news conference following the Fed announcement that he did not believe the U.S. economy is currently in a recession but that it is softening. He also said the lack of clear v…