As quoted in "Take The Money and Run", Sounds (27 December 1990), interviewed by Keith Cameron on 23 September 1990<sup> http://www.livenirvana.com/interviews/9009kc/index.html</sup>
“When told by a constituent that he would rather vote for the devil, Wilkes responded: "Naturally." He then added: "And if your friend decides against standing, can I count on your vote?"”
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John Wilkes 1
English journalist and politician 1725–1797Related quotes
“People who cast the votes decide nothing. The people who count the votes decide everything.”
Variant: Those who vote decide nothing. Those who count the vote decide everything.
                                        
                                        This appears to be a variant of a widely disseminated Republican joke with no published attribution of its authorship to Buckley. 
Mark Hatfield, as quoted in The Condition of Republicanism (1968) by Nick Thimmesch, p. 65 
They told me if I voted for Goldwater we'd be at war in Vietnam in six months — and I did and we were. 
Anonymous voter, as quoted in It All Comes Back to Me Now : Character Portraits from the "Golden Apple" (2001) by William O'Shaughnessy, p. 85 
Buckley did say this on the Firing Line episode "Vietnam: Pull Out? Stay In? Escalate?" According to the transcript  here http://hoohila.stanford.edu/firingline/programView2.php?programID=22, he says "...if someone told me that if I voted for Goldwater, we would escalate the war, I did and we have." 
Misattributed 
Variant: They told me if I voted for Goldwater in 1964, that we'd have more war and higher prices. Well, I did, and we do.
                                    
                                        
                                        Speech at Birmingham, Alabama, published in the Birmingham Post (27 October 1921) quoted in Political Power in Birmingham, 1871-1921 (1977) by  Carl V. Harris (1977) University of Tennessee Press, ISBN 087049211X. 
1920s
                                    
On Nick Clegg and his vote to increase tuition fees http://www.postchronicle.com/cgi-bin/artman/exec/view.cgi?archive=234&num=335499, 30 November 2010.
"The Two-Party System Is Killing Democracy," May 23, 2016 http://www.facebook.com/ajplusenglish/videos/735052996636210/
                                        
                                        The Visitor in Ch. 44 : the visitor, pp. 461-462 
The Visitor (2002)
                                    
                                        
                                        Rep. Eric Massa (D-NY).  http://www.realclearpolitics.com/video/2010/03/08/massa_rahm_emanuel_would_sell_his_own_mother_for_votes.html 
About
                                    
                                        
                                        And yet, I am held responsible. 
Orthodoxy (1884)