The nomination of Kevin Warsh as Federal Reserve chair is reviving a debate about Fed independence. AP Photo/Jose Luis Magana Kevin Warsh is now likely to secure Senate approval as the next Federal Reserve chair – and become arguably the most powerful central banker in the world. But when Warsh appeared before the Senate Banking Committee for his confirmation hearing in April, one punchy question underscored the dilemma that Warsh, lawmakers and the Fed all face: “Are you going to be the presid