Gov. Larry Hogan and the Democratic leaders of the General Assembly quietly worked together this year on a plan to stave off what had been expected to be catastrophic increases in the rates charged by the two insurers on Maryland’s Affordable Care Act exchange, CareFirst and Kaiser Permanente. It involved some real political risk, particularly for Mr. Hogan, since part of the plan could have been construed as a tax increase. (What happened is that the state agreed for one year to collect a health insurance premium tax that the federal government put on hold. Once the feds reinstate it, Maryland will drop it. We don’t consider that a tax increase, but in a political season, somebody could certainly have argued otherwise. It also required the Trump administration, which has made killing the ACA one of its top goals, to sign off.