I must register my disapproval. Dumb they may be, but you could be a little more thoughtful.
"Streamlined ancestoral dependancy" or "Siblingbonking Tories" would be a kinder term. Although their favourite paper needs to combine words like welly and telly to attract the punters "dumb" might give offence to the more academically able.
It's a pity that there isn't a human equivalent of the arm of Crufts that recognised inbreeding problems in dogs.
If the house of commons had something similar we might have a moggmay or govejohnson to vary the gene pool a bit.
I suspect care would be needed to ensure that the right thing was dropped into the poo bag though, certainly a lot more care than that needed to figure out what was labradoodle and what was labradoodle excrement.
AB