In a poll released of over 2500 Americans - a very healthy sample size - released at the end of last month, 67% of Americans favored the US assisting Ukraine in its defense of its country.
Today's Republicans are a group of fringe extremists, out of touch with even the mainstream of their own party. The recent GOP debates are making this all the more obvious.
https://www.defensenews.com/congress/2023/11/30/poll-finds-strong-support-for-arming-ukraine-israel-and-taiwan/