Neither of these drove this crisis. I hope you would agree that this economic crisis isn't on one side of the political spectrum....with that being the case, only pointing out things that can be linked to Dems really weakens your argument. Guilt is rife on both sides of the fence.
You want one of the "unsaid" culprits? Take a look at the Graham, Leach, Bliley Act -- then look closely at what is mentioned many times in this article -- "leverage". The GLBA allowed overleveraging in an unprecented and, now proven, reckless nature.
The market is going through an all out massive de-leveraging and recapitalization effort by the entire financial sector. Since there are no investors to recapitalize these banks -- the only player left is the government. You may not like it, but it's necessary.