A committee of citizens and BIEN-Switzerland are currently collecting signatures for a ‘popular initiative’, which if put to the vote and accepted by the electorate will introduce a basic income into the Swiss Constitution. 120,000 signatures will probably be needed so that the requirement of 100,000 validated ones is satisfied, and half way through the period allowed–which runs until October 2013–the committee has over 70,000. The prospects are therefore good that a binding popular vote on this subject will be held in three or four years. Even if the electorate does not accept it the first time, the chances of success on a subsequent occasion will be increased. The signature campaign has aroused a great deal of interest and discussion in broad areas of public life.

Further information: https://bien-ch.ch/
Official page from the Swiss government:
https://www.admin.ch/ch/f/pore/vi/vis423.html