Every Conservative MP. The whole lot of them.
It's reached the point that whenever I see a comment from MP, I just know their party allegiance, just by the fact it's always sublimely moronic. It's so bad you just want to put your head in your hands and sob. Or if it's after 3pm, drink gin.
I'm sure there must have once been OK-ish, reasonably erudite, Conservatives MPs? Our former MP could at least construct sentences that weren't entirely made from stupid. Admittedly, any actual sentence that didn't sound like a small random collision of words from my current MP would be an achievement of note. I wrote to her to point out my dissatisfaction with my current representation and she sent me back a document about Brexit 'achievements' (it seems this is her response to everything). At least she's only got a support role for the stellar cast of stupid, but really how to compete?
By contrast, and I used to be fairly apolitical, the majority of comments I see from non-Conservative MPs seem reasoned and sensible.