I did like your Sam Weber touch, real nice. I wouldn't mind such an outcome for him.
But yeah, I don't see Samantha falling under the sway of communism. She had too much influence from all directions surrounding her after the visit to the Soviet Union; hell, even if she wanted to be a communist, I think she would be redirected rather quickly.
A senate position is possible in her later life. If not, I could see her being a famous personality later in life that shows up on talk shows or CNN reports occasionally, perhaps throwing the occasional controversial quote taken out of context (or in context, she'd have great potential to be used by the spin machine). Politically? Probably going to be true liberal Democrat.