ON the subject of the Affordable Care Act — Obamacare, to reclaim the name critics have made into a slur — a number of fallacies seem to be congealing into accepted wisdom. Much of this is the result of unrelenting Republican propaganda and right-wing punditry, but it has gone largely unchallenged by gun-shy Democrats. The result is that voters are confronted with slogans and side issues — “It’s a tax!” “No, it’s a penalty!” — rather than a reality-based discussion. Let’s unpack a few of the most persistent myths.

OBAMACARE IS A JOB-KILLER. The House Republican majority was at it again last week, staging the 33rd theatrical vote to roll back the Affordable Care Act. And once again the cliché of the day was “job-killer.” After years of trying out various alarmist falsehoods the Republicans have found one that seems, judging from the polls, to have connected with the fears of voters.

Some of the job-killer scare stories are based on a deliberate misreading of a Congressional Budget Office report that estimated the law would “reduce the amount of labor used in the economy” by about 800,000 jobs. Sounds like a job-killer, right? Not if you read what the C.B.O. actually wrote. While some low-wage jobs might be lost, the C.B.O. number mainly refers to workers who — being no longer so dependent on employers for their health-care safety net — may choose to retire earlier or work part time. Those jobs would then be open for others who need them.

The impartial truth squad FactCheck.org has debunked the job-killer claim so many times that in its latest update you can hear a groan of weary frustration: words like “whopper” and “bogus” and “hooey.” The job-killer claim is also discredited by the experience under the Massachusetts law on which Obamacare was modeled.