The vote was also supposed to force the EU into reforming itself into a more growth - friendly and democratically accountable entity, and secure the U.K. cast - iron guarantees that it won't be sucked into a European superstate in future. (fortune.com)
The Chancellor's aim is to ensure that countries who don't use the euro currency will no longer be expected to be on an unstoppable march towards an EU superstate — «ever closer union». (totalpolitics.com)
Not exactly the same, but they have a quite similar effect, especially if you view the EU as a federal superstate, the ambition of those who created the Welsh Assembly. (politics.stackexchange.com)