By 'this' do you mean screwing up the Iowa results? It's absolutely a self-inflicted injury that there is no excuse for. I attribute it to incompetence, hubris, and probably a good dose of bias. I'll stop short of calling it corruption, but as we learned well after the last election, people really were actively stacking the deck again Sanders.
If 'this' is referring to the in-fighting, I think that's pretty normal when multiple different folks want the nomination. The longer the fight goes on and the 2nd, 3rd, and 4th place candidates remain viable, based on history, I think we can expect the in-fighting to become more intense. It was Bush sr. that coined the phrase "voodoo economics" in a primary fight against Reagan; The Dems ran hard with that in the general election. A big advantage of an incumbent is not having a primary fight. Unfortunately for the Dems, there is no 'likely' candidate at this point.