THIS IS BIG:

A new CNN/ORC International poll indicates a dramatic turnaround in the battle for control of Congress in next year's midterm elections.

Democrats a month ago held a 50%-42% advantage among registered voters in a generic ballot, which asked respondents to choose between a Democrat or Republican in their congressional district without identifying the candidates.

That result came after congressional Republicans appeared to overplay their hand in the bitter fight over the federal government shutdown and the debt ceiling.

But the Democratic lead has disappeared. A new CNN/ORC poll indicates the GOP now holds a 49%-47% edge.

The new survey was conducted last week and released Tuesday.

The 10-point swing follows a political uproar over Obamacare, which included the botched rollout of HealthCare.gov and controversy over insurance policy cancelations due primarily to the new health law.

The turnaround in the CNN/ORC poll follows similar shifts in recent national surveys from Quinnipiac University and Fox News.