What could possibly move Ann Romney to start using Twitter? How about an attack on her credentials as a "working" mom?It all began last night on Anderson Cooper's night time when liberal strategist Hilary Rosen criticized Mitt Romney for leaning on his wife, Ann, when it comes to women's economic issues. Romney has previously said that he knows that the issue woman care most about is the economy, because his wife told him so. Rosen, who was formerly the head of the of the hated music lobby group the Recording Industry Association of America, criticized that approach by saying that "His wife has actually never worked a day in her life." That comment opened the door for the Romney camp, which leapt into a lightning fast counter-attack mode that included getting Ann Romney herself to fire off her first (and so far, only) tweet. Others supporters quickly piled on Rosen accusing her — and by extension President Obama — of attack...