supporter-in-effect
n.— «In the lengthening hall of mirrors created by the war in Iraq, friends become enemies. Legislators who voted against the war are called supporters-in-effect when they try to support the troops without supporting the war.» —“Senator Mikulski finds herself on the other side of the protests” by C. Fraser Smith Baltimore Sun (Maryland) Mar. 18, 2007. (source: Double-Tongued Dictionary)