Although something which seems out of a sci-fi novel, Brainwashing is very real and very common.
As per Wikipedia, “Mind control or brainwashing / coercive persuasion / mind abuse / thought control etc. refers to a process in which a group or individual "systematically uses unethically manipulative methods to persuade others to conform to the wishes of the manipulator(s), often to the detriment of the person being manipulated"
This post at life-hacker tells us about Brainwashing Techniques You Encounter Every Day (and How to Avoid Them)
Now you know why people you loathe, generally always succeed (in politics or whatever else).