Overturning a congressional law is certainly not unprecedented. Judicial review has been a major part of our constitutional system ever since Marbury v. Madison in 1803. And ObamaCare was not passed by a "strong majority." The House has 435 members; the Democrats held a 75-seat majority; and ObamaCare passed by only seven votes. ObamaCare passed Congress without a single vote from the Republican Party, and squeaked through by a parliamentary shenanigan called reconciliation that was never intended for anything so sweeping. Obama's outburst was the result of the fact that the three-day Oral Argument went so badly for ObamaCare that the Administration suddenly realized there is a serious constitutional argument against it.
Obama can't be taken seriously; he and his Party are devoutly committed to the judicial usurpation of the Supreme Court in striking down the anti-abortion laws of 46 states, passed by 46 democratically elected state legislatures. And at the very same time that Obama hurled his arrogant threat to the Supreme Court, he is having his Attorney General refuse to enforce and try to get the courts to overturn the Defense of Marriage Act (DOMA), which was passed by a very strong bipartisan majority and was signed by President Bill Clinton.
Listen to the radio commentary here: