Editor's note: On Friday, Jon Cohn wrote about a new House Republican report about the Affordable Care Act -- and why one of its central claims was wrong. Among the sources he cited was Jonathan Gruber, the MIT economist who has advised policy-makers, including some of the ACA's architects. But Gruber found several other flaws in the report. What follows is his analysis. A new report from the House Committee on Oversight and Government Reform is making headlines because of four claims it makes about the Affordable Care Act (ACA). But some of these claims are wrong-headed.