I, Candidate for Governor: And How I Got Licked cover
I, Candidate for Governor: And How I Got Licked
by Upton Sinclair
ISBN: 0520081986
Buy on Amazon
Found in 1 comment on Hacker News
portman · 2010-08-14 · Original thread
The actual quote, from I, Candidate for Governor: And How I Got Licked:

"It is difficult to get a man to understand something, when his salary depends upon his not understanding it."

A terrific read. http://www.amazon.com/dp/0520081986