Overview

• Tuesday’s vote in Iowa Senate District 1 will determine whether Republicans keep their two‑thirds edge in the chamber, which currently stands at 33–16.
• Democrat Catelin Drey, a Moms for Iowa founder, faces Republican Christopher Prosch, a communications consultant, in the race to fill the seat left vacant by the June death of Sen. Rocky De Witt.
• The DNC says more than 30,000 volunteers are mobilized for canvassing, digital outreach, and calls, with coordinated text and phone banks run with the Iowa Democratic Party.
• District 1 includes parts of Woodbury County and Sioux City, where registered Republicans outnumber Democrats 38% to 31% and the area backed Donald Trump by about 11 points in 2024.
• Prosch has drawn criticism over past statements and posts questioning vaccine safety and 9/11 accounts and equating abortion to the Holocaust, while Drey centers childcare, health care access, and public school funding.