Uh, yeah it was. The following document comes from The Heritage Foundation. Have you heard of them? Republican think tank?
1989 Assuring Affordable Health Care for All Americans
Do you have something, from an earlier date, that shows the mandate being anyone else's idea?
Heritage is not the GOP.
Fail.
Yeah? Lotta liberals and Democrats in The Heritage Foundation is there?
The Heritage Foundation is an American conservative think tank based in Washington, D.C. Heritage's stated mission is to "formulate and promote conservative public policies based on the principles of free enterprise, limited government, individual freedom, traditional American values, and a strong national defense".
No, I'd say not.
So there is no mention of the GOP in their mission sstatement. Nor are all Republicans conservatives.
Fail. Twice.