Stolen elections are treason as long as there is any form of foreign involvement. Literal attempt to overthrow lawful government of and by the people is a coup or insurrection to use the word they give themselves, and if it is done in cooperation with foreign powers that makes it treason.

Treason is punished with execution. Messy, yes, but the only thing politicians understand is consequences and execution is severe enough to make sure it never happens again. Make this a jail term and they won't be sorry because they believe their rich friends will buy them out. Make it fines and their rich friends will pay it. Make it death and they will flip on those rich friends