I doubt there's only 1 reason.
But there's several possible factors.
1) Outside of LA, the Rams just aren't that popular. Heck, even in LA the Rams aren't that popular.
2) The West Coast (the Left Coast) is a bad word for most of the rest of the country.
3) The nation is in an underdog mode.
4) The nation is tired of "experts" telling us how we should think.
5) The Bengals are a great story.
6) Joe Burrow is easy to root for.
7) It's been forever since the Bengals were in a Superbowl.
8) They see the Bengals as destined to win.
