Possible Clues:

• About half of 45-Across attendees
• In-state attendees of Drake University, e.g
• Des Moines Register readers, often
• Des Moines dwellers
• Dubuque residents, e.g
• People with 319 area codes, perhaps
• Danai Gurira and Robin Thede, by birth
• Waterloo residents
• Amana folk