How does campaigning for these things work? Are there resources allocated from the state to make sure it is an informed decision, or is it entirely up to private interests to do that?
Both. The voting material everyone gets includes a booklet which informs about the proposed changes and where statements by opposing and approving parties are to be found (this is prepared by the Federal Chancellery as far as I know). This includes a recommandation on each proposal by the respective governement and parlament (respective, because it depends on which organisational level the vote happens, national, cantonal or communal). Which way the recommandation goes is decided by a vote in parliament and the numbers (how many against/in favour) is printed too.
Before that, there is the usual lobbying by different political parties and it depends on the perceived gravitiy of the changes how much you see. There are billboards, discussions in radio, TV and newspapers. Sometimes there are also other groups coming into the public light as happening now eg. with law professors campaigning against the 'Durchsetzungsinitiative' (the discussion about that one is getting more and more heated).
