From what I can remember, George W. Bush took an early lead and pretty much held on to it through the entire primary season in 2000, despite an early win by McCain (New Hampshire, IIRC). I don’t recall the percentages, but Bush was clearly the dominant candidate.
Thanks. I remember that my choice early on was Alan Keyes.
https://en.wikipedia.org/wiki/United_States_presidential_election,_2000#Candidates_gallery_2