There's two things I see going on here. Firstly, there's the question of whether it's even possible for someone to be an effective politician without lying. There's also the possibility that America is so disinterested and morally bankrupt that politicians know they can get away with saying one thing and doing another. To make things even worse, the amount of scrutiny politicians are now under for even the most minor of things creates such a filter that only the politicians who are willing to spew PR bullcrap or are bulletproof to bad press will make it. It's a complicated issue because, let's say that political theater is far more effective at winning votes than telling the truth or actually helping the voters; an honest person is stuck in a sort of prisoner's dilemma where their most practical choice is to betray any sort of principles they have.
It's routine to make sure potential candidates who won't fall in line don't get their voice heard with equal footing. I would say the majority of the primary candidates in any election are cookie cutter. Trump and Bernie are rare exceptions I haven't really seen in my lifetime until recently.
"I don't care who does the electing, so long as I get to do the nominating."
