"...best way for her to become president is for Obama to lose in November."

1)   Not likely, since he will win.

2) Even if he were to lose, she will only ever have a chance in the future if she tries now to move heaven and earth to get her supporters to vote for him.   If she does not, how much support do you think the Democratic Establishment will give to somebody who did not help the party's presidential candidate this year after he was picked? Particularly when she has trashed him with one of the most negative primary campaigns in quite a while.

Hope this question doesn't strain the poster too much, since it actually requires him to think--probably an unreasonable request.

It's actually rather likely that she has already destroyed her chances for another presidential run forever by her appeals to "hard-working Americans, white Americans" and her blatant hope for Obama's assassination. It's not likely Democratic movers and shakers will want to associate themselves with such sentiments---ever.

But dream on.