Arkansas’s Obamacare Medicaid expansion has been a costly misadventure. The expansion has been so misguided in fact, that lawmakers voted earlier this year to end it, effective December 31, 2016.

That hasn’t stopped state bureaucrats from scurrying to institute a new component of expansion that makes the program even worse.

By upholding the legality of insurance subsidies on the federal exchange, the Supreme Court secured President Obama’s legacy of expanding access to health care. Now Mr. Obama must secure the other fundamental legacy of the Affordable Care Act: controlling health-care costs.

Over the holiday weekend, The New York Times published a lengthy piece confirming and adding to what has been increasingly clear for months: All over the nation, health plans being offered through Obamacare’s exchanges are requesting sizable rate hikes. In particular, popular plans that had attracted large customer bases by offering relatively low rates seem to be pushing for big increases next year, based on filings so far.

The administration’s victory in the latest Obamacare case, King v. Burwell, has relieved Congress of the need to quickly repair or replace the Affordable Care Act. But that does not mean Congress should sit back and wait for the 2016 election and a Republican president to fix the law. In fact, Republicans may have an easy way to reach their policy objectives, in a manner that might attract bipartisan support and even a signature from President Obama.

The Affordable Care Act lives to see another day. Late last month, the Supreme Court upheld the distribution of subsidies, as well as the mandates and penalties attached to them, in the 34 states that use the law’s federal healthcare exchange.

Yet despite this decision, one thing remains painfully clear: The Affordable Care Act isn’t working for millions of Americans. No ruling from the Supreme Court can change that fact.

Congressional Republicans see a repeal of a tax on medical devices as their best opportunity to chip away at the Affordable Care Act after the Supreme Court’s recent decision turning away a challenge to a key component of the law.
The House has already voted to repeal the tax, and Senate Republicans are weighing the best timing for a vote to undo the levy, which helps underwrite the health law.

Roberts’s intellectual complexity does not prevent him from expressing himself pithily, as he did with those words when dissenting in a case from Arizona. Joined by Antonin Scalia, Clarence Thomas and Samuel A. Alito Jr., Roberts’s dissent should somewhat mollify conservatives who are dismayed about his interpretive ingenuity four days earlier in writing the opinion that saved the Affordable Care Act. Furthermore, they, including this columnist, may have missed a wrinkle in Roberts’s ACA opinion that will serve conservatives’ long-term interests.

The urge to merge is sweeping managed health care. Aetna announced Friday a $37 billion deal to acquire Humana. Anthem and Cigna are in merger talks and could be next. The national for-profit insurers are on an anxious mission to consolidate. These combinations will sharply reduce competition and consumer choice, as five big insurers shrink, probably, to three.

Oregon’s insurance regulator has approved big premium increases sought by health plans for 2016 under the health law, and in some cases ordered higher raises than insurers requested, signaling that the cost of insurance for people who buy it on their own could jump after two years of relatively modest growth.

Convention claims the Supreme Court’s King v. Burwell decision is a loss for conservatives. But Democrats shouldn’t celebrate. Politically, it’s a win for the right, skirting potential harm in terms of legal precedent as well as improving positioning for 2016.