Dumb As Stumps
I know this is a sensitive topic and rapidly degenerates into name-calling ("intellectual snob!" "eugenicist scum!" etc etc) but once again I wearily raise the question of whether, for the good of all humanity, we should introduce IQ testing for all candidates for public office. I accept IQ ain't perfect but, done properly, it's the least bad method we have now, if tests are sanitised for cultural bias and education, and cover the full cognitive gamut across verbal, math and visuospatial aptitude.
In the UK we have a bunch of howling cretins in the Tory Party, people like IDS ("Stupid, even for a Guards officer"), Owen Paterson, Liam Fox, Angela Leadsom and the brain donor David Davis, busy turning into shyte every single thing they touch. (And May has been hiding her brain cell rather effectively too.)
In the US, the presidency is currently infested by someone who was dropped on his head at the age of ten and has not matured a day since. Trump may be the most astoundingly ignorant human being ever to step into the Oval Office and is doing Vlad the Emailer's work in dragging America through the muck.
If Man-Made Climate Change is the most serious threat faced by humanity, Number Two must surely be Imbecilic Fools In Office.
Given the evidence of damage done by these hopeless morons, I don't think it would be unreasonable to set 110/115 (a little above average, but not implausibly 'gifted' level) as the required IQ cutoff point, averaged across all aptitudes.
Further, by running a retroactive qualification process, we get the advantage of kicking out maybe a third of sitting MPs and congresscritters (the "encumbrances" rather than "incumbents") thereby immediately cleansing the stables of some of the worst dross.
The Defenestrated Ones need not fear that their noble, sefless calling to public service will be wasted, however: we urgently need information on how refugees cope with new environments, so I propose that any wealth they may have accumulated/inherited/stolen is given to refugees' charities, and they themselves are sent to war-torn countries, whose language they do not speak, to experience life as benighted rejects, fleeing from one hostile environment to another. Any who survive can send reports to inform policy which (they can take great comfort in knowing) will be made by people smarter and better qualified than they are.