Here's the American Heritage Dictionary definition of Propaganda - educate yourself!

noun

1.

information, ideas, or rumors deliberately spread widely tohelp or harm a person, group, movement, institution, nation,etc.

2.

the deliberate spreading of such information, rumors, etc.

3.

the particular doctrines or principles propagated by anorganization or movement.

4.

Roman Catholic Church .

a.

a committee of cardinals, established in 1622 by PopeGregory XV, having supervision over foreign missions andthe training of priests for these missions.

b.

a school (College of Propaganda) established by PopeUrban VIII for the education of priests for foreignmissions.

5.

Archaic . an organization or movement for the spreading ofpropaganda.

Also, this is the best example of propaganda I can think of right now:

http://obeygiant.com/images/2008/10/obama.jpg

Here's a hilarious parody for those of you who "identify as liberals" I dig the simplicity:

http://www.disclose.tv/files/photos/30b6b8f7a8e3dbaL.png