Final answer:
The poster said: "Give One Vote to the Man of Your Choice and the Other to the Sister." The message encourages voting for both men and women candidates, highlighting the importance of women's rights.
Step-by-step explanation:
The poster featured a picture of MacAdams and had the words: "Give One Vote to the Man of Your Choice and the Other to the Sister." This poster was likely used during an election campaign to encourage people to vote for both men and women candidates. The message implies that by voting for women candidates, you are not only supporting them but also showing support for sisters, which represents the importance of women's rights.