Obamacare is a federal law and so can't violate another federal law. OTOH, it does grossly violate the Constitution.
The Democrats have not been bothered by violating the US Constitution, even though THEIR White House resident has sworn to protect it.
BTW, isn’t that the logic behind the “Move On” organization: pass illegal Federal Laws, and MOVE ON to passing more illegal laws, because when it is a Federal it can’t be illegal, just Move on.