This is what she said yesterday:
"“I think we can bring home one to two combat brigades a month,” she said. “I think we can bring nearly everybody home, you know, certainly within a year if we keep at it and do it very steadily.”
In truth, that's pretty much in accord with her previous statements. Unlike Bill Richardson, she'd leave a residual force in Iraq, but at the rate of two combat brigades a month, most of the troops would be redeployed in a year. Clinton isn't able to say that not a single US troop would be in Iraq by the end of her first term, although Richardson has made explicit that promise.
So -- not a flip-flop. But still a good way for Richardson to draw attention to himself.