You told your supporters you needed their donations so you could compete in Wisconsin, because a loss there would put you out of the race. So they float you another million and change, and now that you realize you can't win there, you've changed your mind?!
This kind of contradiction is what Iowa voters (including me) sensed, before the "scream," and is the reason so many of us turned away. Saying one thing, often with great conviction, then coming back later to revise, rephrase, reverse positions. This does not build confidence in a candidate.
It is the same perception that cost Gore dearly in 2000. Most people, even if they disagree on the issue, will respect a candidate who takes a well-thought-out position and sticks to it, even if it becomes unpopular. But once you develop a critical gap in credibility, it is truly over, even if you don't know it yet.