Political campaigns are usually comparable in scope.
Obama, for example, beat Nike and Apple to win the "marketer of the year" award https://adage.com/article/moy-2008/obama-wins-ad-age-s-marke...
I remember being so excited and enthusiastic. People were banging pots and pans in the streets and celebrating. But looking back, I am not sure what happened. I don't even know why I was excited. And that's the power of propaganda and marketing, it presents a fuzzy abstract canvas and allows everyone to imbue their own, private hopes and dream onto it.
In the more recent history, the "Russian collusion" is probably another campaign where so much effort was spent on, families were torn apparent, a lot of mental energy put into it, and then it kind of fizzled out. All of the sudden everyone stopped talking about it. It went from "it was a sure road to impeachment" to everyone at the same time deciding to ignore it.