It defeats the whole point of the suggestions board. We want to see what fans truly feel about different suggestions. Which suggestions are the most truly popular among the playerbase. Spiritless votes defeats that whole purpose.
Remember, we cannot guarantee that every suggestion will be accepted by the developers. This suggestion board is only a source for inspiration and discussion, not a to-do list. And even if we do like the suggestion we might decide to reinterpret it during implementation.
If by “campaigning” you mean simply letting people know that you’ve made a suggestion and telling them to vote for it if they support it, then yeah sure that’s okay, in fact even good so that we see the suggestions and consider them. For example, you could open a thread to discuss it here on the forums, and in the OP you link to the suggestion you made on the Suggestion Board.
What’s more it’s also okay to make a thread trying to persuade people why your suggestion is a good idea. For example, maybe you think implementing X organelle will improve the gameplay, and people are initially hesitant. You can create a thread explaining how you think it will improve gameplay, and try to persuade people with your arguments. However, at the end of the day, it’s their choice how to vote. So there should be no “trading” of votes like “I’ll vote for yours if you vote for mine”.
The “trading” of votes is what it sounded like TheForumGameMaster was suggesting when he said “go around the forums asking for peoples’ support, and ask them to vote for my feature”. That’s what’s not allowed.