Ih he attacks Mitt to his face with lies about Bain, Mitt will knock the ball out of the park. He built Bain. It has a wonderful reputation with a 90% record of success in helping companies. Mitt will just talk about those successes.
Romney must be bold, any response should first and foremost feature his own agenda, dire state of current affairs and own plans and ideas. Never start with explaining, only feature that as an illustration and a side dish to the main course.
Obama’s underlying point is that Bush made it so bad, no one would deal with it any better than Obama. Always state that everyone before Obama did much better than him, incl Reagan that dealt with the market crash of 1987, inherited a horrible economy in 1980 and miserable state of the foreign affairs.