I’ve been shown this quote and this specific image a few times now, in the aftermath of the NV convention.
Here’s the thing: nobody here is making “peaceful revolution impossible.” This is an election, a peaceful and inclusive process, and your candidate is simply not winning it. It is false to portray this as some corrupt system making your revolution impossible.
If your idea of revolution is electing your revolutionary candidate, of course that’s possible: you just go get the most votes. Other people have done it in previous years. Our system of government lays out a very obvious, accessible, peaceful process to get there.
Conversely, if your candidate is not winning, it does not mean that bad people or a bad system has made that win impossible. Such rhetoric is irresponsible: it shifts blame, it falsely lays blame, and it is inflammatory. It unfairly erodes public trust in the institution of democracy. It also flies in the face of undeniable observation---the other candidate is clearly winning on account of getting more votes.
If this quote reflects the way you view the state of the Democratic primary, I would skip the JFK quote and go with Jon Stewart instead: I think you’re confusing tyranny with losing an election. I think this mindset reflects a histrionic view of democracy in which not getting what we want is an act of persecution---and as the JFK quote implies, dangerous behavior is inevitable if people actually start viewing the world that way.