President Obama expressed regret Thursday for the “burden” he placed on fellow Democrats with the glitch-riddled rollout of his signature health care law, especially those facing re-election in the 2014 midterm elections.

“There is no doubt that our failure to roll out the [Affordable Care Act] smoothly has put a burden on Democrats, whether they’re running or not, because they stood up and supported this effort through thick and thin,” Obama said at a news conference. “I feel deeply responsible for making it harder for them, rather than easier for them, to continue to promote the core values that I think led them to support this thing in the first place.”

Obama made the remarks while announcing an administrative fix for the health care law that would allow insurance companies to renew for a year the millions of existing health plans they canceled because those plans didn’t meet Obamacare’s stricter requirements. Obama had repeatedly promised that people who like their existing insurance plans would be allowed to keep him, but recently apologized for breaking that promise.

A provision had been added to the health care bill to preserve those existing plans, but Obama acknowledged Thursday that “it was insufficient.”

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