This is so true.
Mencken�s November 2, 1936, article � published on the eve of the national election pitting incumbent president F.D.R. against challenger Alf Landon � �The Choice Tomorrow�:

For people in the mass soon grow used to anything, including even being swindled. There comes a time when the patter of the quack becomes as natural and as indubitable to their ears as the texts of Holy Writ, and when that time comes it is a dreadful job debamboozling them.