Mary and Ann agree on the following five judgments
1. Bernie would be a better president than HRC
2. HRC is more likely to beat any Republican candidate than Bernie
3. Trump would be a less awful president than Cruz
4. Trump is more likely to lose, and more likely to lose big, against either Dem candidate than Cruz
5. Because of coat-tail effects, the most important thing is the biggest possible Dem win in November.

They vote in an open primary State. The polls are all over the place, so there is no reliable information, and both think it is best to vote on the assumption that both races will be close.

Mary will vote for Bernie, because she believes in voting for what you actually prefer and believe in.
Ann plans to vote for HRC, because she is a strategic voter and believes you should vote so as to have the best chance of producing the best outcome. Mary claims that the logic of Ann’s position is that she should not vote for HRC, but for Trump.

I’m not interested in debating any of those assumptions, some of which seem plausible, others very dubious, to me. Please accept them for the sake of argument. I want to know whether Mary is right about what Ann should do (given Ann’s view about the ethics of strategic voting) and why, if she is right, so few people I know who hold Ann’s view, and accept the above assumptions, will vote for Trump in Wisconsin today.