The posters have been popping up like guerilla art across downtown Washington, D.C.

One of them, glued to the plywood walls of a construction site, depicts former Secretary of State Colin Powell's 2003 testimony to the U.N. Security Council in the run-up to the invasion of Iraq. "This is What Happens when there is No Second Opinion," the poster reads. "Iraq War: No WMDs. 141,802 civilian deaths."

Another poster next to it warns: "In case they shut us down on TV, Go to for the Second Opinion."

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