“Nearly forty years after I first got involved, I remain captivated by the possibilities of politics and public service. In fact, I believe that my chosen profession is a noble calling. That’s why I wanted to be a part of it.”–Joe BidenAs a United States senator from Delaware since 1973, Joe Biden has been an intimate witness to the major events of the past four decades and a relentless actor in trying to shape recent American history. He has seen up close the tragic mistake of the Vietnam War, the Watergate and Iran-contra scandals, the fall of the Berlin Wall, the reunification of Germany, the disintegration of the Soviet Union, the aftermath of the 9/11 attacks, a presidential impeachment, a presidential resignation, and a presidential election decided by the Supreme Court. He’s observed Nixon, Ford, Carter, Reagan, Clinton, and two Bushes wrestling with the presidency; he’s traveled to war zones in Europe, the Middle East, and...