Yes, the state of Iowa's democratic party platform does include marriage equality.
Libertarian Party of Iowa was created in 1971.
Democratic Party - Singapore - was created in 1955.
Democratic Union Party was created in 1947.
Labour Democratic Party was created on 1943-09-08.
Lithuanian Democratic Party was created in 1902.
Women's Democratic Party was created in 2004.
Democratic Party - Burma - was created in 2010.
Democratic Party of Oregon was created in 1851.
Maryland Democratic Party was created in 1827.
California Democratic Party was created in 1846.
Nagaland Democratic Party was created in 1999.