Conversation so far:
when did the voting age get lowered to 18
On July 5, 1971, President Richard Nixon formally certified the 26th Amendment of the Constitution, which granted 18 year olds the right to vote.
who certified the adoption of the 26th amendment
The Administrator of General Services, Robert Kunzig, certified the adoption of the 26th amendment
Who were witnesses to the passage of the 26th amendment besides Robert Kunzig?
President Nixon and Julianne Jones, Joseph W. Loyd Jr., and Paul S. Larimer of the Young Americans in Concert also signed the 26th amendment certificate as witnesses.
why was the 26th amendment important to the student movement
Student Movement declared that if they were old enough to be drafted into war, they should be old enough to have a voice in their government.

Question: what was the proponents' slogan
Self-contained rewrite: what was the 26th amendment proponents' slogan