Look, Trump is saying "there was no vote". Maybe that explains why his supporters didn't show up to the votes that were indeed held on March 1. If he didn't know there was a vote, why should they?
“Colorado is one of ten states and four territories that opted for caucuses or state conventions over primaries. That does not make it undemocratic. “
It pretty much does in my view. Making it difficult for the regular, non party hack people to decide is what, if it is not undemocratic?