The average man votes below himself; he votes with half a mind or a hundredth part of one. A man ought to vote with the whole of himself, as he worships or gets married. A man ought to vote with his head and heart, his soul and stomach, his eye for faces and his ear for music; also (when sufficiently provoked) with his hands and feet. If he has ever seen a fine sunset, the crimson color of it should creep into his vote. The question is not so much whether only a minority of the electorate votes. The point is that only a minority of the voter votes.
The fact that a man is to vote forces him to think. You may preach to a congregation by the year and not affect its thought because it is not called upon for definite action. But throw your subject into a campaign and it becomes a challenge.