reporter: thank you, everybody. who could forget that moment? that was then the vice president joe biden obviously sharing what he intended to be kind of a personal moment, but you know how those hot mics work, and it became history. the larger history was the hailing of president obama signing the aca into law. that was 2010. it was indeed a big deal. i ll just call it a big deal. obama s landmark legislation was initially controversial in some ways, it was resisted in some ways, but you the point tonight is more about policy than partisanship, which why i want to get into this with you with many things going on in the country. obamacare transformed parts of the american health care system, and it has done that over time in concert with even republican-led states it expanded coverage to not one or