I'm going to refuse to sign my colleague's political party list
Why do you want to refuse to sign your colleague's political party list?
I don't agree with his political views.
Fair enough. You shouldn't have to sign that list if you don't want to.
I want him to stop running too I might sabotage it.
You have the right to your own beliefs and should not be forced into anything. Causing a scene and sabotaging your coworkers might create a hostile work environment and you might be fired.