Democrats are increasingly employing a new tack in the battle over a projected reduction of two million jobs due to Obamacare, saying the decline is actually the result of people not being required to work anymore when they don't want to -- a concept labeled "job lock."

"Yesterday, the CBO projected that by 2021 the Affordable Care Act will enable more than 2 million workers to escape 'job-lock' – the situation where workers remain tied to employers for access to health insurance benefits," House Minority Leader Nancy Pelosi's (D-Calif.) office said in a news release.

The release continued: "In addition to being just plain wrong on the facts of the CBO report, the GOP seems to have forgotten that ending 'job-lock' has been an avowed Republican goal for years – even a highlight in the Republican Sen. John McCain’s 2008 presidential race."

House Budget Committee Ranking Member Chris Van Hollen (D-Md.) also mentioned the concept of "job lock" on Wednesday. Senate Majority Leader Harry Reid (D-Nev.) has used it too.

The concept is not a new one and has been cited by Democrats in the context of Obamacare before. But it came to light this week following the release of the CBO report.

Democrats are right that conservatives have pushed the idea of reducing "job lock" before -- including a Heritage Foundation study and McCain in 2008. Neither, of course, prescribed Obamacare as the cure.

Democrats have cried foul over the GOP's portrayal of the report. Republicans have said the report shows how Obamacare will kill 2 million jobs by 2021, but the report is far more nuanced than that, and the job losses are in large part due to people no longer needing work in order to acquire health insurance.

That is just one of the reasons cited in the report for the decline in jobs, though.

Updated at 3:28 p.m.