[HotKat]

I don’t understand it either. Did the 900,000 voters in CO vote on this convention system? Who came up with it?

[UCANSEE2]

Did the 900,000 voters in CO vote on this convention system?

There was no vote on that. It's not something that is up for a vote. It was a 'rule change'. From what I understand, it was made that way during the last Presidential nominee process to keep Ron Paul out.

Who came up with it?

My guess would be the top Republican Party Leadership.