IA-03 is def interesting; I think many people overestimate how red the district actually is, especially since Miller-Meeks literally won by 6 votes in 2020 (underperforming Trump) and didn't do all that impressive in 2022.
Still, it's an uphill battle and I'd say Trump probably carries IA-03 again Presidentially; really the only good part of the district for Dems at this point is Johnson County and idk how many more votes they can squeeze out of it.
Miller-Meeks represents IA-1, and Johnson County is in IA-1 too.
IA-3 is the Des Moines district represented by Zach Nunn.
But anyway, I think IA-3 is a swing district the rest of the decade. Nunn only won by 0.7% in 2022 and that was with no Libertarian on the ballot. Polk and Dallas Counties are still growing and trending D, and are the overwhelming majority of the district too.