By Trevor Hunnicutt and Howard Schneider WASHINGTON (Reuters) – President Joe Biden is planning a media blitz to lift his sagging opinion poll numbers before November’s congressional election, promoting his management of America’s recovery from the coronavirus pandemic and efforts to cool spiraling inflation. Biden’s meeting with Federal Reserve chair Jerome Powell to discuss inflation on Tuesday was the first event in a multi-week agenda, a White House official said. Through June, the official said, the White House plans to emphasize the historic levels of job creation and low unemployment ra…