As with everything in life, much of the Clinton campaign's current argument can be explained away with a simple football analogy.
Let's say there's a coach of a certain college football team. We'll call the team OSU, which stands for Outrageous Sneaky Underhandedness--which, of course, is in no way meant to indicate a certain skuzzy Ohio football team.
It's the second quarter and one of the OSU offensive linemen gets called for holding. I've always had trouble with the holding penalty--sometimes they call it and I say, "where?"; and sometimes they don't call it when it's flagrantly obvious to anyone with eyes.
Anyway, the coach disagrees with the call, and argues with the ref. He loses the argument, as coaches often do. And then, if he's part of the Hillary campaign, he cries, "The holding penalty is wrong! It's unfair! It's subjective! It must be revisted, or else the outcome of the game is illegitimate."
The coach isn't wrong. The holding penalty is strange, subjective, and maybe unfair. The problem is the timing.
The time to complain is in the preseason. When the games have been going on for months with certain rules in play, you can't stand up in the middle of game #6 and shout, "Unfair!" Because, during the season, the rules are the rules.
Sometimes, people do complain during the preseason, and the powers that be invent new rules. Occasionally, these rules are terrible--witness the BCS. However, the BCS is how college football determines a winner; maybe it's not such a good system, but it's the system, for now.
If you're planning on campaigning for president, and you don't like caucuses, the time to bring that up is WELL before the first caucus. If you're a state who's sick of holding a primary in the middle of the season, but the powers that be award earlier primaries to states that aren't you, then you should probably suck it up and deal until after the election, when you can lobby again to change the rules.
No one's saying our electoral system is perfect. But let's be honest about what it means to complain about the rules in mid-game. It means you probably didn't mind the rules until they went against you. Or, if you're Mark Penn, you didn't understand caucuses or proportional voting--and due to that and many other factors, the Clinton campaign has all but lost.
And come on. Even Jim Tressel takes the time to understand the rules.