No, not Martha Plimpton; she's too skinny. In The Renewable Virgin there's a scene narrated by Fiona, the college professor, in which she marvels at the way Kelly can eat and still stay slender. Then she thinks that Marian looks like a person who would put on five pounds if someone said the word "chocolate" in her presence. So Marian isn't skinny. I guess Frances McDormand has the right body type, but I just can't see her as Marian. Too matronly.
Dang it, Barbara, how old is Marian?