Right at the moment Ernst is ahead in polling, but only by 1%.
Exactly which Federal officials would be affected since, after all, they largely aren't located in Iowa, and whether she would also arrest people who applied for Obamacare and doctors who accepted it she doesn't say. It is hard to imagine local police arresting IRS officers, but that would seem be implied.
This may all be moot, however. The Supreme Court may get the opportunity to support these states rights advocates and may well do so, by siding with the plaintiff in Halbig and Halbig-like cases, making ACA care inaccessible to people not solidly middle-class in 36 states.
If so, my black-feathered brothers and sisters will feast.