<p>What more could there be to know about FDR, given how exhaustively his life has been written about? As it happens, there is more and that focuses on Lucy Mercer Rutherfurd, the queen of her Washington social circle, later FDR's friend and love-and Eleanor's rival, as the title of Christine Totten's work points out. In Lucy Mercer Rutherfurd: Eleanor's Rival, FDR's Other Love, Totten presents a carefully structured case for a deep and lasting ...