No judge can issue an injunction to keep a candidate off the ballot except in a single state.
There were scores of attempts to get injunctions to keep Obama off the ballot in many states, they all failed.
A higher court can always lift an injunction.
Did you see the Term Federal? Yes a federal Judge can and will and its for all states until reversed or the USSC overturns it. And guess what. they are 4-4 right now.