Agreed with the general logic. I just think they could have done a better job with her epiphany, as it were. Nevertheless, I still think Frank's rant had a ton of truth to it. Sure, he was a dickhead about things when he didn't have to be at a few points, but he wasn't wrong. There's only one chair. He forced her down everyone's throat as Ambassador with an overreach, and her failure there wasn't Frank's fault; he didn't throw her under the bus the way he did to others, and in fact gave her every benefit of the doubt within reason. And now by leaving, she's potentially pissing away the rest of her political career. (Unless she has some sort of elaborate plot in mind to avoid that fate.. but that's not really how they portrayed what was going on inside her head.)
She's just trying to hedge her bets. She was initially wary of Frank's ability to overcome the odds and win a Presidential term in his own right and, after realizing that Frank can no longer realistically help her achieve her goals with her (as opposed to simply handing them to her), she realizes she has to leave him.
I think she just failed to realize the disparity in their relationship that would occur once Frank become President. When Frank was a Congressman, they were more or less equals in terms of prestige, him steering Congress and her steering her major NGO (and both effectively steering policy). Now that the disparity is so evident to her, she realizes she has to take a step away from Frank's shadow in order to begin to achieve for herself again. I don't think it's personal, it's just what's best for her, which is (mostly) what Frank has been all about himself.
Claire leaving could mean pissing away her career, or it could indicate a major reversal of fortune for her. In leaving Frank, she's basically tossing the dice like Frank did in Season One. Maybe she's already formulated a grand scheme to rival Frank's own machinations. By leaving, she might be proving herself more ruthless than Frank himself in due time.
I think she just failed to realize the disparity in their relationship that would occur once Frank become President. When Frank was a Congressman, they were more or less equals in terms of prestige, him steering Congress and her steering her major NGO (and both effectively steering policy). Now that the disparity is so evident to her, she realizes she has to take a step away from Frank's shadow in order to begin to achieve for herself again. I don't think it's personal, it's just what's best for her, which is (mostly) what Frank has been all about himself.
Claire leaving could mean pissing away her career, or it could indicate a major reversal of fortune for her. In leaving Frank, she's basically tossing the dice like Frank did in Season One. Maybe she's already formulated a grand scheme to rival Frank's own machinations. By leaving, she might be proving herself more ruthless than Frank himself in due time.