I don't understand if you're intentionally obstinate or just oddly brainwashed? I'll try one last time, in a simple sentence.

Cannot vote for means even if the entire result is tied and it hinges on one vote, my vote does not count under any circumstances; it can't change the outcome at all.

Is that better? 85% of Americans are literally in this situation.

So every time your side loses a vote is equivalent to "cannot vote for"? Interesting perspective.