--The myth that the Crusades were a Christian war to take Muslim land;
--The myth that Marxist and Fascist are opposite ends of a spectrum that has conservatives on the fascist side;
--The myth that FDR ended the depression;
--the myth that the constitution provides a "wall of separation" between church and state;
--the myth that Islam is a "religion of peace".
There are many others, but those are some big ones.
That list is a good start.
Good list.
Btw, how's that "hope and change" working out for you?
No propaganda there, I'm sure. ;-)