Yes, the state democratic party platform for Oklahoma does include marriage equality.
Democratic Union Party was created in 1947.
Democratic Party - Singapore - was created in 1955.
Labour Democratic Party was created on 1943-09-08.
Party for Democratic Prosperity was created in 1990.
Sandžak Democratic Party was created in 1995.
Saguan Democratic Party was created in 1899.
Lithuanian Democratic Party was created in 1902.
Malaysian Democratic Party was created in 1998.
British Democratic Party was created in 1979.
Korea Democratic Party was created in 1945.
Citizens' Democratic Party was created in 1993.