When you're asked "could you see yourself working to support Hillary Clinton" if your husband doesn't win, there is only one right answer to that question.

"I’d have to think about that" was not it.

Edit - adjusted to cite Mrs. Obama's exact words as seen here

http://www.youtube.com/watch?v=d7yaD9OXZ_o

as there have alrady been several disingenuous "but that wasn't the question" responses.