Yes, the state of Iowa's democratic party platform does include marriage equality.
Libertarian Party of Iowa was created in 1971.
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.
Oklahoma Democratic Party was created in 1907.