There’s a lesson from President Obama’s first term that he should have learned long ago. It’s simple: On an issue that affects many millions of Americans, it’s best—even necessary—to have bipartisan support in Congress. Going forward in a purely partisan fashion is bound to cause national discord, increase polarization, and heighten distrust in Washington. Worse still, it means the issue will be controversial for years to come.

The enduring unpopularity of Obamacare—indeed, the Republican commitment to repeal it—is an example of what can happen when bipartisanship is spurned. In this case, Obama and congressional Democrats made no effort to attract Republicans. They declined to compromise, offering Republicans zilch. They were mesmerized by their huge majorities in the Senate and House.