By David Morgan and Ann Saphir WASHINGTON (Reuters) -The U.S. Senate on Thursday confirmed Jerome Powell to a second four-year term as head of the Federal Reserve, paving the way for him to continue leading the central bank as it confronts the highest inflation in 40 years. Powell, who was renominated by U.S. President Joe Biden, drew bipartisan backing in the divided Senate, with a final tally of 80 senators in favor of his confirmation and only 19 opposed. Most of the nays were Republicans, though a few Democrats, including Robert Menendez and Elizabeth Warren, joined them. Menendez said Pow…