"OK, I'm confused. What would be the Hildabeast's motivation in all of this?"
Let me try.
Hillary knows that there are more seats up for grabs in 2008. If Reid goes who will be Senate Minority leader? And if the RATS win who will be the Senate Majority leader?
No lose for Hillary. She will be nominated to take either spot. Plus it is free press for Hillary plus at the same time, she can declare that the RATS also clean their own house which might actually save some seats.
Hillary made her move today.
Baloney. Hillary has nothing to do with this.