Yes, the state of Iowa's democratic party platform does include marriage equality.
Democratic Union Party was created in 1947.
Democratic Party - Singapore - was created in 1955.
Libertarian Party of Iowa was created in 1971.
Labour Democratic Party was created on 1943-09-08.
Democratic Front Party was created in 2007.
Hazara Democratic Party was created in 2003.
Democratic Generation Party was created in 2006.
Maryland Democratic Party was created in 1827.
Democratic Party - Yugoslavia - was created in 1918.
Croatian Democratic Party was created in 1989.
Senegalese Democratic Party was created in 1974.