We’ll see. DeSantis is working to win Iowa and he’s not going around dissing Kim Reynolds. And unlike Trump, he’s on the same page as Iowa Republicans regarding abortion. Time will tell if his ‘full Grassley’ works.
In 2007, Sen. Chris Dodd actually moved his family to Iowa and enrolled his daughter in school. He campaigned almost full time for months.
For the ‘88 election, Sen. Dick Gephardt moved with family members to Iowa for campaigning there. Sen. Paul Simon also rented an apartment in Des Moines for intensive campaigning.
Nobody makes their campaign in Iowa, but a lot of candidates are weeded out there, more recently, Kamala and Tulsi.
Caucus rules have changed. Now, delegates to the next level are bound by the presidential preference voting results.