Who comes close?
Neville Chamberlain?
Petain, but he wasn't voted into power.

Not Trudeau - many knew he was unsuitable from the start.
Same with Macron, Zelensky, the Finn, Jacinda, George W. Bush.

Reagan disappointed people, hear that a lot.

Merkel and Boris, maybe?

Trump though, holy shit
and still potentially another 3.5 years