The only theory I haven’t heard advanced is the most likely reason for his vote: Everything is about the money. Roberts was doing the bidding of the insurance companies that have part ownership in our three branches of government. Private insurers stand to make a killing off Obamacare and voting it down would’ve cost them billions. With this vote, the only person taking a political hit is the unelected Justice John Roberts, while the rest of the court and the Republicans in Congress can register phony outrage and keep the base frothing at the mouth over tyrannical government health care. By the way, frothing at the mouth is covered under Obamacare.
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