DENVER (AP) — The battle over whether to allow Colorado supermarkets to sell wine and beer could end up being decided by voters themselves and opponents are going on the offensive.

Colorado liquor store owners and breweries expect a ballot proposal in the 2016 election and launched an opposition campaign called “Keep Colorado Local” Thursday.

Currently, Colorado law only allows businesses to have one liquor license, which has prevented chain stores from selling alcohol. That has led to a proliferation of small, independently owned liquor stores which have fought repeated efforts to change the law at the state Capitol. They’ve gotten strong support from many of the state’s craft brewers, who say the current set up has also helped them grow and offer a variety of quality beers.