Hi Helise,
I'm afraid that a biopic about the two major leaders of Women's lib in the america of the XIXe Century is not a very popular topic around the corner (no blood, no murder, no postapocaliptic world, no aliens...).
That being said, it is matter for a good and interesting story.
About the title : I don't like it because it can give rise to confusion (they where not marxists).
Something better would be the title of Elisabeth Stanton's book "The Women's Bible", or "Not for Ourselves Alone" wich is the main title of a documentary by Ken Burns (Not for Ourselves Alone: The Story of Elizabeth Cady Stanton & Susan B. Anthony, 1999)(*)
About the logline: it is still to be written
About the story and its target: I don't know what you want to do. Here is my own opinion:
- Women's rights battle is part of History and is eclipsed in the collective unconscious by the Black power and the Civil rights movement battle of the late 50' and 60'.
So I think it would not be a big idea to deal with it in a militant way or as a docu-fiction.
A conventional three-acts-movie biography with deep shaped characters, with place for their relatives, their family lifes... would be a better way I think.
I hope this would be useful.
I'm waiting for your logline. ;-)
(*) http://en.wikipedia.org/wiki/Not_for_Ourselves_Alone:_The_Story_of_Elizabeth_Cady_Stanton_%26_Susan_B._Anthony
http://www.imdb.com/title/tt0220253/