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PIERRE, S.D. (AP) — Members of the Oglala Sioux Tribe passed a referendum to legalize medical and recreational marijuana on the Pine Ridge Reservation in South Dakota, according to preliminary results from the tribe's election commission.

A proposal to allow alcohol in the tribe's casino failed.

The results of Tuesday's vote will be certified in the next week. In the tally from all precincts announced on Wednesday morning, both medical and recreational marijuana passed by wide margins, with 82% of voters approving medical marijuana and 74% approving recreational pot. The alcohol proposal failed by 12 percentage points.

Nebraska State Sen. Adam Morfeld of Lincoln, a co-chair of an effort to put a medical marijuana initiative on the November ballot, said he's looking forward to the same wide margin of victory for the issue in Nebraska.

Morfeld said that his group's polling "indicates it will be."

Nebraska Gov. Pete Ricketts, who says that medical marijuana's benefits are unproven, said earlier this week that voters will reject it once they become more educated.