Studio 60 on the Sunset Strip

Sarah Paulson, a noted Broadway actress who's had roles on a few failed TV shows (including Jack & Jill where she costared with Ms. McDeere herself, Amanda Peet) has been mentioned as a possibility for Harriet Hayes. I've never seen Paulson in anything, so I can't speculate how good she'd be, but I certainly hope she gets it, just to put an end to the Kristin Chenoweth and Emily Procter rumors (two actresses I adore, but who shouldn't be cast, due to most people not wanting this to be The West Wing Goes Hollywood)

At any rate. Hopefully we'll know soon.