2016 Oklahoma Democratic primary
{'<entity_0>': '2016 Oklahoma Democratic primary', '<entity_1>': '2016'}
[['2016 Oklahoma Democratic primary', 'point in time', '2016']]
The <entity_0> took place on March 1 in the U.S. state of Oklahoma as one of the Democratic Party's primaries ahead of the <entity_1> presidential election.
['election', 'primary election in the United States']