You might have seen a headline in the Washington Post today, or a link to the Lori MontgomeryWaPo story at any number of conservative sites, touting a “new study” showing that ObamaCare would “add $340 billion to deficit.”

Jonathan Chait helpfully says pretty much everything that needs to be said to debunk the idea that this is anything particularly new or worth worrying about. I won’t quote the whole thing or go through his reasoning, but basically the “new study” is just another GOP effort (authored by Republican Medicare trustee Charles Blahous) uaimed at “proving” that ACA adds rather than detracts from the federal budget deficit, in this case by pretending much of its Medicare savings would have been achieved anyway, thus denying them a spot on the positive side of the ledger.