Republicans have insisted for years that Obamacare would make health insurance more expensive — and this week they have eagerly seized upon new evidence that appears to feed their claim.

Prices for 2016 haven’t been finalized, and premiums had been growing more expensive before the Affordable Care Act was ever passed. But many insurers are proposing to raise premiums significantly next year, some as much as 70 percent, based on their initial filings.