From NBC to CNN? Jeff Zucker, the former NBC Universal chief executive, is reportedly the frontrunner to succeed Jim Walton as president and chief executive of CNN. A final announcement could be made by the end of the week, The New York Times reports. Before his criticized run as head of the NBC’s primetime lineup, Zucker successfully oversaw the Today show’s unprecedented morning reign, and the overhaul of the network’s coverage of the Olympics and elections. Former ESPN exec Mark Shapiro is also in consideration.