On "Mad Men's" end: "It's bittersweet … what I just keep thinking about is the last time that they say 'Cut' and call 'Check the gate,' and that's the last time I will ever play Peggy. That, to me, is so strange. That I will never open my mouth as that character again is so weird to me. I think I'll probably just be sort of numb about it, and then it'll hit me eight months later."