How is what he did dumb?
He only continued to refuse to increase the spending limit, which is basically the only thing he promised to do if he was elected.
I mean, that position is completely wrong in the current situation, but it's not a change from his position 3 years ago.
Yeah he came in with an agenda (block all legislation that could hurt his luxury car daddies). And he achieved all if that. Now his job is done and he gets to retire early.
He rendered the left-leaning government ineffective, making a shift to the right in the next election more probable, then triggered early elections.
Genius, really.