I think we are entering an interesting political equilibrium where we have a significant number of voters who either (a) are not truth-oriented and care mostly about the emotional vibe coming from candidates or (b) believe that candidates would be foolish to tell the truth when it would disadvantage them with type (a) voters. The more voters who fall into types (a) and (b) the less worried candidates will be about telling the truth and the eventual equilibrium is where almost all voters are (a) or (b).