Plot: Campus Battleground, a special in the America at a Crossroads series, focuses on the University of California-Berkeley and Columbia University in New York where, in the spring of 2006, pro-Israel and pro-Palestinian students struggle over the competing claims of Zionism and Palestinian nationalism. Since the 1960's, the American university has often been less a free marketplace of ideas than a combat zone where partisan groups forcefully and sometimes fiercely argue their positions on national and world affairs