Sunday was the day liquor stores can begin staying open on Sundays if they choose to.

Colorado is the 35th state to permit Sunday alcohol sales at retail stores. It's the 13th state to pass such a law since 2002, according to the Distilled Spirits Council of the United States. That's the trade group that has lobbied for such laws across the country.

The council lost an attempt to repeal the Colorado blue law three years ago. Liquor store owners opposed the move but many changed their minds this year to help prevent supermarkets from winning the right to sell full-strength beer and wine.

Supermarkets say they should be now be allowed to sell beer and wine because few people will continue to by the 3.2 percent beer they're allowed to sell.