Personally, I think this is a bad choice of words. She should have said, "Ann Romney has never held down a job a single day in her life." Then us on the left at least could have retreated to our dictionaries:
Activity involving mental or physical effort done in order to achieve a purpose or result.
A paid position of regular employment.
I don't see where the point of all of this is really. If someone says something and then realizes that they are wrong. Why should they be blamed for being corrected? That is, of course, if her addendum and apologies were sincere. (Only saying this for those who will bring up Limbaugh.)
Synonyms for Work:
job - labor - business - labour - occupation - employment
(Might paint a different picture I suppose)