"Might as well have been voting for the moon" is used by
Robb Johnson in his song
Jubilee Gardens. It expresses that feeling whereby your
quality of life is
crap, for whatever
reason. You vote
Conservative.
Things don't get better. You vote
Labour. Things don't get better. You vote
Liberal Democrat. Things don't get better.
Closely related to
whoever you vote for, the government wins, and about as
idealistic.
Voting because your vote counts? Voting to make your life better? Might as well have been voting for the moon.