California, Oregon, Illinois, Hawaii, Colorado, New Jersey, & Nevada will happen either before or on Election Day 2016.
Pennsylvania, Michigan, Virginia, and Wisconsin might get it depending on how their Governor and other down-ballot races end up.
In won't be on the Wisconsin ballot until at least 2018, unless the Republican legislature acts now to approve the amendment (very unlikely). Wisconsin requires that constitutional amendments be approved by the legislature during two consecutive sessions before appearing on the ballot.