The Big Club are massive and complex networks of lobbying groups who actually write legislation.
Within The BIG CLUB there are, essentially, two larger factions with interest: Big Labor and Wall Street (big crony-business). There are other factions like Big Green (Al Gore) etc. However, for the sake of ObamaCare the two that matter are “Big Labor” (AFL-CIO, SEIU, AFSCME, UFCW etc), and Wall Street (U.S. Chamber of Commerce, Tom Donohue).
The Big Club has paid for ObamaCare’s construct, and they are not going to allow their sales force to walk away from it. From their position, this is a massive ‘multi-multi-hundreds-of-millions’ expenditure that has already taken place.
The Chamber of Commerce already lost hundreds of millions when TPP was lost due to Donald Trump. The TPP loss followed the loss of Comprehensive Immigration Reform (2014 Dave Brat), and the loss of Common Core Education standards.
Wall Street/Chamber of Commerce spent hundreds of millions on Gang of Eight, Common Core, TPP and ObamaCare.
Having lost TPP, Go8 and Common Core, there is no way Wall Street is going to accept losing his biggest investment to date, ObamaCare.