Yeah, it's all Newt's fault Romney's winning. /s
The only shot left is for all of the not-Romney to stay in and take delegates from Romney. None of them can outright beat him head-on at this point. It's too late and we learned this week Santorum's camp admits it. Newt's camp knows it and Ron Paul's strategy depends on it.
If a not-Romney gets out, Romney benefits because a sizable pool will flock to him rather than Newt or Santorum.