It is possible, that at one time he had an IQ of 149.
Today, not so much.
Bill Clinton, yeah I might believe 148
The whole decimal thing in IQ scores is beyond stupid, it is there to make you think that someone can accurately measure your IQ, which is in itself total BS.
Hunter Biden is a great example, one day he might be smart, the next day his cognitive abilities might drop to near Zero
I watched the Bork and Thomas confirmation hearings extensively. Biden and Ted Kennedy were embarrassingly dim witted. JFK was probably a lot smarter than Teddy.