Claire has been passed over again and again for far too long, and she is not the type of person to take all of it lying down. She has been continually denied positions and accused of only getting where she is because of her relation to Frank. She is, and always has been, simply an accessory to his public life, his Presidency, and his campaign. Claire Underwood is not the type of woman to sit back and enjoy being number 2 for her entire life. Frank tells her it’s always been this way, and that she’s always known this, but something seems to have snapped. Perhaps she doesn’t believe Frank can become president anymore, or perhaps she just can no longer stand the idea of only ever being number 2. Either way, she has abandoned Frank, and will no doubt find another more efficient route to greatness, most likely her own campaign, or possibly joining Heather Dunbar on the ticket.
Claire has already been quite popular (and unpopular) with the nation over her abortion and affair scandals. She’s been featured on many news channels and been interviewed several times. However, no publicity is bad publicity. Claire’s name is now out there — and people know her. All she has to do is get those who support her to continue to support her, and get those who don’t, to keep talking about her. She seems to be reveling in the spotlight and building her popularity and name to possibly use in a future campaign. After all, Donald Trump has been getting a lot of hate, but is still doing quite well for himself.