The people involved in this march and protest were displaying their sympathies with the reformers in Iran. More than anything, these people (including myself) wanted and want democracy and freedom for the people of Iran.
While most protesting were in support of Mousavi, a few warned that there is really no difference between Mousavi and Ahmedinejad. They were both selected by the Supreme Leader. Clearly all assembled expressed support for real democracy and real freedom in Iran.