Related Clues:

• Its caucus is often raucous
• River, city or state
• Caucus site
• It lies between the Mississippi and the Missouri
• The Hawkeyes of the Big Ten
• ''Field of Dreams'' locale
• See 6 Across
• Skunk River state
• Sioux City setting
• Straw poll setting
• "The Music Man" setting
• John Wayne's home state
• Sioux City's state
• Davenport locale
• Midwestern state