Practically every time you cast a vote, you're voting on multiple races, propositions, etc. The chance of casting a tie-breaking vote in a local election (say f

Practically every time you cast a vote, you're voting on multiple races, propositions, etc. The chance of casting a tie-breaking vote in a local election (say for City Council) is probably better than 1 in 10k. If you have several such questions, then there are some tangible odds that your vote may make a difference. Keep in mind that in those rare cases where a race is one by one vote, _everyone_ who voted for the winning side cast a deciding vote.