I think people are forgetting again how young they were during the elections. She was a teenager. Teenager's aren't generally mature enough to do the right thing when relationships get complicated. Some of them will, some of them won't. Doesn't mean they're bad people.
Even now they're still relatively young. And emotions are often complicated. I said before and I'll stand by it: her reaction after they slept together probably comes from a realisation that she still has strong feelings for him. It could be she regretted leaving him before and has suppressed that and the sex brought it back and she doesn't know what to do. So she tries to push it back down and him away.
I'm not excusing it. I'm saying it doesn't make her a bad person. She can change and make up for what she did. Let her feelings out and accept him for the person he is. I expect she will.
PS: I don't think he was ever a "careerist asshole" nor did she want him to be one. She wanted him to be ambitious. She wanted him to take a good opportunity that was being given to him for reasons that, while he didn't like them, were in no way underhanded - and remember, the reasons he was disliked before were based on Sam telling the voters that he was only in the race because he was friends with the current president and this was elitist and unfair, so you could view the swing in the opposite direction as reasonable, because people started to think of him as a person and not a target for resentment of the elite. If he'd taken the president position he wouldn't have been taking advantage of anyone. And my take is he would have done a good job. The fact that the way he got it concerned him is enough to show that he actually cared about the job being done by the right person for the right reasons. Which made him well suited to it.
