Health care will define the midterms. Donald Trump's move to gut Obamacare guarantees it.

Donald Trump and the Republican Party just put America’s health care squarely on the November ballot. After a year of trying and failing to repeal the Affordable Care Act, the Trump administration, in cahoots with 20 conservative states, has asked the courts to strike down several pillars of the ACA — including its protections for Americans with pre-existing health conditions.