Which ... sort of gives away the deal a bit. Trump started complaining about the process only after he got shut out in Colorado -- a function of Ted Cruz's campaign outworking him under the rules of that particular contest. Trump's won states where the delegates were awarded through a normal vote and, sometimes, through a caucus. In Colorado, he lost, badly. And the system became "rigged."

He's right when he says he's not complaining about the states that he won. After all, in most of those states, he got disproportionately more of the delegates than he deserved based on the percent of support he received in the voting. In 27 of 34 contests, Trump got a higher percentage of the delegates than he did the vote.

Every dot on that graph that's above the diagonal line is a state in which Trump got more delegates than he would have gotten if they were given out perfectly fairly; that is, proportional to the number of votes in the state.

Contrast that with Cruz and John Kasich. Cruz has a few more states in which he got too few delegates in a perfectly proportional distribution. Kasich had far more places where that was the case.

In fact, if anyone should be complaining about the rigged system, it's Kasich. Two-thirds of the time, he's gotten a smaller percentage of delegates than he has the vote. Even Marco Rubio did better than that.

To date, Trump has gotten about 37.5 percent of the votes in Republican party primaries, according to the U.S. Election Atlas -- and 43.7 percent of the party's delegates. This is intentional; the GOP has been able to avoid the near-tie situation in which the last two Democratic primaries have gotten bogged down.