text: Arguably, based on the Catholic definition of sin, the answer is that voting for a particular politician could be a sin.
   II. THE DEFINITION OF SIN
  1849 Sin is an offense against reason, truth, and right conscience; it is failure in genuine love for God and neighbor caused by a perverse attachment to certain goods. It wounds the nature of man and injures human solidarity. It has been defined as "an utterance, a deed, or a desire contrary to the eternal law."121
  
  Equally arguably, depending on your own values and beliefs on reason, truth and right conscience,  voting for Mr Trump, Secretary Clinton or Mr Duke, could be a sin.
  
  The decision this year is between a boorish undisciplined man with frat house language, and a lying woman  whose documented actions are far worse than anything anyone has said.  Which vote is actually a mortal sin won't be known by us until we are discussing with St Peter what we did on Earth to justify getting into Heaven.