The Obamas are vain enough to think she could win. But I can't believe she would. She has none of Barack's glibness and superficial charm. Her anger is clear for all to see.
On the other hand, her ideology is purer than Barack's. He's (in approximate order) Muslim, Marxist, Racist, Green, and Queer. She's racist, racist, racist, racist. It could make a difference with the squishy white self-hating liberals if it's so obvious.
No one, left or right, could argue with that. But to many on the left, it doesn't matter. Maybe some of them even see it as something good.