Merkley says he was always in favour of a Single Payer, Medicare-for-all instead of ACA which is flawed & atleast a public option would have got costs down. He also says the system with exchanges in the ACA & others are pretty complex. He says ACA has done good things & even has support in some conservative counties which swung away from the Dems in 2010 !
You had 3 potential 2020 candidates - Merkley, Warren & Gillibrand speaking about support for a Single Payer system !
https://www.youtube.com/watch?v=jQV2F6Un1qI