The fate of Obamacare is in the Supreme Court’s hands yet again

The Supreme Court announced on Monday that it will hear California v. Texas and United States House of Representatives v. Texas, two consolidated cases that represent an existential threat to Obamacare, and that were brought by a coalition of Republican-governed states. For the third time since President Barack Obama signed the Affordable Care Act in 2010, the justices will hear a lawsuit seeking to eviscerate the legislation.

Texas turns on Congress’s decision to repeal Obamacare’s individual mandate. As originally enacted, the Affordable Care Act requires most Americans to either obtain...