**Sarah Trone Garriott holds a strong lead in trader pricing for Iowa’s 3rd Congressional District because her campaign has built clear advantages in fundraising and positioning in this competitive seat.** As of late June 2026, she had raised $5.29 million compared with incumbent Zach Nunn’s $4.87 million, giving her greater resources for the fall campaign. Forecasters rate the race a toss-up or lean Democratic, reflecting the district’s narrow margins in recent cycles and Garriott’s record of winning Republican-leaning Iowa Senate seats. In the final week before the September 25, 2026, market snapshot, Garriott drew attention to Nunn’s earlier votes against full release of Epstein files and associated donor ties, sharpening contrasts on accountability and transparency issues that resonate in a battleground district. Upcoming October debates and continued outside spending will test whether these factors hold through Election Day.