Last month, national polls by CNN/ORC, Fox News and NBC News/Wall Street Journal got plenty of attention, and they certainly helped readers and viewers understand what is going on in the Republican and Democratic presidential contests.
But if history is any guide, early national polls are far less valuable in understanding what is happening in the presidential contest than are reliable surveys of Iowa voters, such as the NBC News/Wall Street Journal/Marist polls. CONT.
Stuart Rothenberg, Roll Call