Although Iowa isn't deep red like its neighbor to the west, Nebraska, the state has been a frequent source of frustration to Democrats. President Barack Obama won Iowa in both 2008 and 2012, but the state went to Donald Trump in 2016 and 2020. And Iowa is home to Religious Right-friendly Republicans...
Roughly half of voting* Americans. The population is hardly over a third Republican.
We don’t know what non Americans think (by definition), but you can’t just immediately count them as “not republican”.
Anecdotally, my parents are republican, think Trump is better than Biden, and that the charges against him are all fake - they also can’t be bothered to vote, and told me the other week that they haven’t voted in years, because they live in CA. and don’t think their red vote will count for anything in such a blue state.
I obviously didn’t try very hard to dissuade them from continuing that habit, but my point is that there are absolutely people who support Trump despite his criminal charges who dont vote or respond to polls