All polls are for Iowa:
Hillary Clinton and Barack Obama are tied within the margin of error, while John Edwards lags. Mitt Romney and Mike Huckabee are also statistically tied. [CNN/Opinion Research]
Clinton is first, with a statistical tie between Obama and Edwards. Edwards has a significant lead as a second-choice candidate. [Insider Advantage]
Huckabee leads Romney 29 percent to 25 percent, though within the margin of error. In this survey as well, Clinton maintains a small lead over a dead heat between Obama and Edwards. [Reuters/C-SPAN/Zogby]
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