“Do you really think your vote in an election actually affects all of Klal Yisrael? (Even at the collective voting level, I’d be hesitant to say so.)”
In Eretz Yisrael, for sure! Every vote makes a difference.
I read that there were Gedolim who refused to forgive people who voted against Daas Torah in an election in EY a few years ago.
There was one election about 20 years ago in which the different parties flew people in from chu”l to vote. They obviously felt that every vote made a difference.
I tried getting a free ticket a few years ago from the political parties for an election for mayor, but I was not successful :(.