(CNN)Health care emerged as the most important issue for choosing a nominee among Iowa Democratic caucusgoers, according to the entrance polls conducted Monday before the caucuses began.

Two in five chose health care, and about 1 in 5 said climate change, while fewer chose foreign policy or income inequality.

DOWNLOAD THE WAR ROOM PODCAST FREE

The party has been bitterly divided over health care throughout the primary campaign. Sens. Bernie Sanders of Vermont and Elizabeth Warren of Massachusetts have called for replacing private insurance with “Medicare for All,” while candidates like former Vice President Joe Biden, former South Bend, Indiana, Mayor Pete Buttigieg and Sen. Amy Klobuchar of Minnesota have called for a public option while maintaining existing private insurance systems.

Almost 3 in 5 Iowa Democratic caucusgoers support replacing private insurance with a government plan. Almost 2 in 5 oppose that.

READ MORE AT CNN