What made them "not serious"? Did they have shit opinions? Did they forget their lines? Or was it just that they weren't popular enough?

I bet you it's the latter. Well who makes people popular? We fucking do. We share their shit on social media. We talk about them on forums, with family, friends, and strangers. We buy their merch and plaster it all over the place. But because the US population was told "Biden's your only chance", they rallied behind him.

Not behind some independent with values, with new proposals, with credentials, with opinions of this age, with the ability to stay awake during a debate. No. The citizens of the USA got behind some old fart they were told to.