Using Sean Lavery's division spreadsheet and Imad numbers for total RCA wins, I broke the Chairman's candidates down by division. Each Division is listed by number of RCA winners (Chairman's candidates) and Total RCA (for those candidates)
Code:
Division RCA winners Total RCA
Archimedes 10 24
Curie 5 9
Galileo 13 22
Newton 12 22
Galileo has the most (13) Chairman's candidates (it is stacked with more than just Regional Champions). However, Archimedes has 24 total RCA over the history of their 10 Chairman's candidates, which I think indicates it has more "favorites". Still, only one team can win it and the judges don't look at division. Good luck to all!