I’ve heard in previous discussions that Abby Finkenhauer would have a shot.

However, in 2020 Finkenhauer lost re-election in IA-01 by a tad less than 3% points. That doesn’t suggest to me that she’s battle tested in IA beyond serving one term in the House during when Trump was unpopular heading to the 2018 midterms.

Michael Franken did lose to Senator Grassley in 2022 by around 12%. However, Grassley as an incumbent Senator has more seniority than Ernst and by contrast is much tougher to challenge. Not sure Franken wants to take another dive at running for the Senate again.