Who is currently the stupidest member of Congress?
It would be easy to point to crazy conspiracy theorist Taylor-Greene, but how much of that is actually stupidity, and how much is fooling the stupid followers. Likewise, Gaetz acted stupidly in pursuit of sex, but sex makes many of us stupid. He was arrogant, but that is taught not necessarily lack of intelligence.
Lack of intelligence is not about success or failure. Cronkite interviewed every President from FDR to Bush, and said Carter was the smartest. Not the most successful, but the smartest. There is an important difference.
So I would say Madison Cawthorn. He was homeschooled, and just barely passed the test to get a high school degree. The test is easier than going to high school. He then road in a car with a drunk friend and got into an accident. That part is the stupidity of youth, so I am not counting it against him. Before the accident, even with strong political support from his powerful local family, he was rejected from Annapolis. It is difficult for the Navy to overrule a Congressional appointment to their academy, they only do that when the candidate is dumber than dirt.
Cawthorn was backdoored into Patrick Henry College, because he was so clearly unqualified even for a third rate college they could not get him in through the front door. He flunked out after one semester. He blamed the injury for his inability to read a book, but there is no evidence he was ever able to read a book.
Then he watched TV for four years... And after that, he was elected to Congress by the state of Tennessee.
I am not even joking.
Here is a quote by him, claiming his stupidity is caused by his accident(remember, the Navy had already found him completely stupid before the accident):
You know, suffering from a brain injury after the accident definitely I think it slowed my brain down a little bit. Made me less intelligent. And the pain also made reading and studying very difficult.