A resolution called for ending the ability to vote for U.S. senators. Instead, senators would get appointed by state legislatures, as it generally worked 110 years ago prior to the passage of the 17th Amendment in 1913.
“We are devolving into a democracy, because congressmen and senators are elected by the same pool,” was how one GOP delegate put it to the convention. “We do not want to be a democracy.”
So much of modern conservatism/Republicanism in the US is pure reactionary, “own the libs” thinking. If Democrats wanted to pass a resolution stating “puppies and kittens are cute,” they would be opposed merely on principle.