Readers interested in the lives of similar people in American History may like, The Education of Henry Adams, The Life of Abraham Lincoln, and The Autobiography of Thomas Jefferson.
Franklin's Poor Richard's Almanac makes a good supplement to any activities related to Franklin's experiments, proverbs, virtues, and an all-around interest in his character and ideas (rather than his political achievements alone).
Consider The Memorable Thoughts of Socrates by Xenophon, here, for a supplement to exercises regarding the Socratic method, in which Franklin expresses interest in the text.
