Just turn them upside down.
Sends the same message.
I would (personally) never be able to turn the American flag upside down myself, or deface it in any way, as with paint, but I like the idea of using white flags to make our point on every Obama issue. Disrespect to the flag is an enemy attack.
Foreign policy = white flag
Domestic policy = white flaf
Fiscal policy = white flag
Race relations = white flag