In case you're not aware of this, there will be a huge March on Washington on Saturday, January 27, to demand an end to the war on Iraq.
Every peace and justice group will be organizing buses. Religious organizations, women's groups, queer groups, environmental, student, labour, civil rights, disability rights - everyone you can think of is organizing for a massive demonstration.
Contact any local progressive organization to find out how you can get involved, or just Google "march on washington january 27" and your state or city.
Get on a bus.