I am not aware of anyone in the United States making a high-profile, publicized attempt to produce political campaign materials specifically for voters with intellectual disabilities. It sounds like a worthwhile thing to do, and a pretty interesting task.
For one thing, there are so many types and shades of intellectual disability ... which I believe is what the BBC means when they say, "learning disability".
And how, exactly, does one "translate" a party platform so that intellectually disabled people can understand it? What does "simplifying" mean? Do you take out all the metaphors and colloquial phrases? Do you use shorter words and fewer compound sentences? How does "large print" help an intellectually disabled person with (most likely) normal eyesight?
Or, is it about more than grammar and font size? Are there social studies texbooks designed to teach adults with intellectual disabilities what "liberal", "conservative", and "libertarian" mean? Do you try to alert intellectually disabled voters to opaque, misleading slogans that all sound good, even when they contradict each other?
I would really like to learn more about this. ----------