Try to promote the pro-life case that we have described within the Democratic Party and you will at best go unheard and at worst be shouted down. Try to advance the case for economic justice as we have described it within the Republican Party and you will be laughed out of court. Above all, insist, as we are doing, that these two cases are inseparable, that each requires the other as its complement, and you will be met with blank incomprehension. For the recognition of this is precluded by the ideological assumptions in terms of which the political alternatives are framed. Yet at the same time neither party is wholeheartedly committed to the cause of which it is the ostensible defender. Republicans happily endorse pro-choice candidates, when it is to their advantage to do so. Democrats draw back from the demands of economic justice with alacrity, when it is to their advantage to do so. And in both cases rhetorical exaggeration disguises what is lacking in political commitment.
In this situation a vote cast is not only a vote for a particular candidate, it is also a vote case for a system that presents us only with unacceptable alternatives. The way to vote against the system is not to vote.
Thoughts from Alasdair MacIntyre that I remember every voting season. (This article is no longer online, as far as I can tell, but it is often quoted.)