Here's what will change when the nation's largest insurer leaves Obamacare

President Obama's landmark Affordable Care Act was seemingly dealt a huge blow Tuesday when the nation's largest insurer by number of people covered, United Healthcare,announced it was leaving the state exchanges in all but a "handful" of states.
These exchanges are the cornerstone of Obamacare, which provides a marketplace for Americans who don't have work insurance offering coverage to them and their families.
While it would appear that United Health's exit would radically change the game