In his White House memoir, “Courage and Consequence,” Karl Rove recalls being the lone non-lawyer among the group of George W. Bush aides who initially interviewed John Roberts for the Supreme Court in 2005. Rove asked Roberts to go back in history to name the justice whom he most revered. Roberts’ answer, Robert Jackson, intrigued and reassured Rove. When appointed in 1941, Jackson was serving as Franklin Roosevelt’s attorney general and had been expected to be a pro-New Deal rubber-stamp on the court. But, as Rove put it, Jackson “instead demonstrated a fidelity to the Constitution that Roberts admired.”