Here's why it will be an exceptionally important day for the Affordable Care Act.
The most important day for the Affordable Care Act is not whichever day Republicans schedule their next vote to repeal and replace it (if they do).
The most important day for Obamacare is June 21, 2017. About three months from now — on, coincidentally, the very first day of summer — health insurers have to decide whether they will sell coverage on the Obamacare marketplaces.
