Clearly, there have been dirty politics played behind the scenes against Trump. I see/hear the "all within the rules" comments. Just because something is legal it does not make it the right thing to do. Drinking alcohol is legal, but if you are an alcoholic you are setting yourself for terrible failure if you drink it.
Same with playing games after the voters have spoken or setting up systems that circumvent citizens even voting. In NH the voters have spoken. Do it right to reflect their vote. The party establishment circumvent the will of the people when they don't. They are actually giving Trump another poker to stick in their eye when they do this stupid stuff. He plays it up big in the media, which gets him even more votes. They are unintentionally helping his cause. Like that stupid dialog Cruz had with the Trump supporter today. He could not win that confrontation with an average Joe no matter how nice or rational he was with his arguments. Why try? He just came across as even more condescending and less likable. So Trump gets even more votes from average Joes and Janes.