She'd have to ditch the title if she ever went into politics (surely she would keep it, seeing as Fergie is still Sarah, Duchess of York). I'm not sure if Meghan would really want to give that up?
Don't you have to have megabucks to run for office in the US? She'd get a good divorce settlement, but would it be enough? I wonder if a divorce would lead to smears being thrown from both sides. It could end up being even messier than this book and put paid to any of her chances.
She needs to play this carefully. At this stage it looks like she holds all the cards in the event of divorce, but if Harry returns to the fold, you can bet the "men in grey suits" will build up a solid defence.