From The Argument :Billionaires, Bloggers, and the Battle to Remake Democratic Politics, by Matt Bai, page 175:

At one point in the [summer 2005] meeting, when the participants agreed that it was important to go into the midterm elections with some kind of positive message, rather than just attacking Bush and the Republican Congress, Rahm Emanuel, [chair of the Democratic Congressional Campaign Committee] who hated circular discussions, shook his head in disgust. “I have my knee on their vertebrae,” Emanuel snapped, “and I’m not going to let up on the pressure until I hear the vertebrae snap.” There followed a brief moment of frightened silence.

Remember that next time you hear Democrats lamenting that they lose races because they’re too nice.

Just think, William Safire predicts Emanuel will be Hillary’s running mate.