Five new major polls on the Democratic presidential primary race in Iowa were released this last week, with three putting Vermont Senator Bernie Sanders on top and two showing former Vice President Joe Biden as the favorite in the Hawkeye State.

The Emerson College and Siena College/ New York Times polls released last weekend showed a sizeable lead for Sanders, with a nine-point and eight-point lead, respectively, on Biden. The Suffolk University/ USA Today and Monmouth polls showed Biden on top in Iowa with a six-point and two-point lead, respectively, over Sanders.

Continuing the trend from previous polls, other candidates have fallen further down in the polls and distanced themselves significantly from Biden and Sanders. Massachusetts Senator Elizabeth Warren averaged 15 percent among the five polls, while Indiana Mayor Pete Buttigieg held 16 percent support in a poll average.

The Iowa Democratic caucuses take place on February 3. While the state doesn’t offer many delegates compared to larger ones like California and Texas, it's the first state to vote in the primary and a good initial test for any campaign.