Sarah Trone Garriott holds a strong lead in trader consensus for Iowa’s 3rd Congressional District due to her slight fundraising edge, record of winning competitive races as a state senator in Republican-leaning territory, and the seat’s narrow margins in 2022 and 2024. Both candidates ran unopposed in the June 2 primaries, leaving a general election matchup between the Democratic challenger and Republican incumbent Zach Nunn in a district rated toss-up or lean by most forecasters. The outcome will influence House partisan balance, with the November 3 vote still weeks away and room for late shifts in polling or turnout.