U.S. Senator John Fetterman (D-PA) knows how to win an election when you’re getting hit, and he has some advice for President Joe Biden, who is working to repair the confidence some Democrats have in his ability to get re-elected in November. A small number of notable Democrats reportedly have voiced strong concerns about President Biden, whose debate performance nearly two weeks ago stunned and scared many. On a private call Sunday with top House Democrats, U.S. Rep. Jerry Nadler, the 77-year old New Yorker who has served in Congress since 1992, became the most-senior Democrat in the country …