This is just revisionist history on Roberts and Scalia. They may vote left every now and then but you are acting like it is with every single vote. Roberts originally was siding with the conservatives on the ACA but switch for some reason.
As Robert himself recently said in response to President Trump’s recent criticism of the Ninth circuit court of appeals, it’s not supposed to be Liberal/conservative or a political ideology thing-it is supposed to be about the constitutionality of laws.
Roberts got a little flak for that from people who claimed that by even saying that he was politicizing things, but oh well.
I don’t know why anyone would think that Roberts initially thought something and then changed his mind, or that any politician had any influence on the case once it had started to be heard.
The court is always pretty secluded within itself; if they believe the case has the merits of being heard by the Supreme Court they choose to hear it; After supporting and opposing arguments are made they discuss things among themselves, they vote, and depending on the outcome a majority decision is written by a person who voted with the majority and if people want they can write dissenting opinions. I think everyone can write a dissenting opinion or a secondary majority opinion.
I don’t know why you would claim that Joe Kennedy had anything to do with this process.
I’m pretty sure Robert wrote the majority opinion that the ACA is constitutional.
As I recall, in his opinion Roberts laid out the governments arguments,which were threefold.
I don’t exactly remember the first two-I knew them at y time of the decision and I guess I could go back and look them up again-but the first two arguments were rejected by the majority as unconstitutional; however, the third argument that the ACA was in fact a tax was supported as a constitutional prerogative of the government to levy such a tax and therefore stood up to the scrutiny of judicial review.
Ironic that before that Obama and the ACA supporters steadfastly argued that it was not a tax, but that’s politics for ya.
Edit: Oh I just realized I guess you meant Anthony Kennedy who would have been on the court at the time. Joe Kennedy is in the house of representatives and he is of course of the fabled and legendary Kennedy clan, the namesake and great-grandson of President John F Kennedy’s father.
EDIT 2:
Last paragraph under the Anti-Injunction Act section.