Um...I think you may be wrong about this....
"During the 2008 election he was a consultant to the Clinton, Edwards and Obama presidential campaigns. In 2009–10 he served as a technical consultant to the Obama Administration and
worked with both the administration and Congress to help craft the Patient Protection and Affordable Care Act (PPACA)."
A note on just who Gruber is...
"In January 2010, after news emerged that Gruber was under a $297,000 contract with the Department of Health and Human Services, while at the same time promoting the Obama administration's health care reform policies, many suggested a conflict of interest.[2][3][4]
While he did disclose his DHS connections in an article for the New England Journal of Medicine, he did not do so in earlier articles in major publications, which he either authored, or in which he was prominently cited. The New York Times published a clarification, noting he failed to disclose his government ties, as their paper requires, before publishing op-eds.[5] Ezra Klein (of The Washington Post) and Ronald Brownstein (of The Atlantic) issued statements to this effect.[6][7]
The conservative Americans for Tax Reform organization has called for Gruber to return the DHS money from his contract, due to his lack of disclosure.[8] Liberal commentator Jane Hamsher of FireDogLake Action criticized Gruber and the Obama administration for this lack of transparency.[9]"
Jonathan Gruber (economist) - Wikipedia, the free encyclopedia
So, I would say his opinions are relevant....