The search on CB is limited to 500 matches, and then further limited by your visibility into those posts. I did a search for posts in the college football categories between August 1st and today. Here's what I came up with:
"utah state" | usu | aggies | aggie - 5,323 posts
boise | broncos | donkey - 4,999 posts
I had a slightly wider search with USU (more terms), and the Aggies did edge out the Donkeys by a little bit.
I couldn't add "bronco" to the search terms, for obvious reasons. If I take "aggie" out of the USU terms, to make it even, theirs drops to 4,905, which means that Boise edges out USU.