Advocacy groups across the country have launched major campaigns to promote President Barack Obama’s Affordable Care Act. The aim is to inform uninsured Americans about health insurance exchanges and government subsidies — and persuade them to sign up. Open enrollment in the new programs begins Oct. 1, 2013. It’s estimated that more than 75 percent of uninsured Americans are not aware of the changes ahead. A government report released yesterday questioned whether the exchanges would be ready. Critics of the Obama health law said the report confirmed their doubts. Diane and guests talk about implementing the Affordable Care Act.