For years, Republicans have run inaccurate attack ads based on President Obama's misleading claim that health-insurance premiums would decline by $2,500. (Meg Kelly/The Washington Post)

Every now and then, we come across a claim that just doesn’t seem to go away — no matter how factually inaccurate or misleading. This iteration has to do with a pledge from then-candidate Barack Obama and nearly a decade’s worth of Republican attack ads that followed.

In 2008, Obama pledged his health-care plan would reduce premiums by $2,500. The Fact Checker at the time awarded Obama Two Pinocchios for the pledge, saying it was based on shaky data. But the pledge itself was misleading. Obama was suggesting future projected costs would decline by $2,500 — not immediate, actual expenses. In other words, if health-care premiums were expected to rise $5,000, they would only rise $2,500.

Obama was less than clear with his wording, and the Republicans took the former president’s claim at face value. They ran ads, which we have also previously checked, suggesting the rise in health-care premiums was a result of Obamacare, or the Affordable Care Act. The Republican ads were equally misleading. Health-care premiums will always go up, but since Obamacare was implemented, the rate that premiums are growing has slowed.

The moral of the story here: Two wrongs don’t make a right.