I understand you're offering this as a gotcha but I'm not sure what you're referring to and it's unclear from context.

In any event, both of those things are typically undemocratic which is why they are rare in functioning democracies and common in autocracies. No system is invulnerable to attack so in certain circumstances they aren't undemocratic. Excluding candidates for, say, a criminal record, mental incapacity, or foreign obligations is less democratic but no reasonable person would claim it voids the will of the people.

Not sure where you're getting the "overturned" part, but if you're trying to point out the the DNC runs roughshod over party members, then you're right only in the sense that they suck.

What sucks more is having a two-party system -- the game is pretty well rigged by that. Voters have the choice of the lesser of two evils. But at least there's a choice involved.

So, comrade, you have failed to sway me. I don't put party before country, even if I was a party member. I doubt you can say the same.