? Suppose I prefer candidate A to candidate B. Then I should vote for A, obviously. But suppose I realise that candidate B is more likely than candidate A to defeat comrade O? Then the question could become not whether I think candidate A is better than candidate B, but does my support for candidate A exceed my hatred for comrade O?
Lets put it more personally. A lot of folk on here prefer Newt Gingrich over Herman Cain. Gingrich is smart, he's got a better campaign team than Cain and he certainly has a lot more practical political experience. HOWEVER, Cain might very well be a better candidate to put against Obama.
You got it and these are the questions with which we all must wrestle.