Every federal district judge in the country could give an opinion upholding OBotcare, a federal law, as constitutional except for one who found OBotcare unconstitutional. The unconstitutional finding would be the binding opinion, the law of the land, that would invalidate the federal law.
The opinion stands until the federal government formally appeals the holding where an appellate court takes the appeal and then rules contrary to the unconstitutional opinion against OBotcare.
This is why the socialists love to go judge shopping. Instead this time, they are the turkeys on the defense trying to hold the line.
I'm sorry, but in order to convince me of this, you're going to have to provide a citation -- or at least an example where it happened.