Washington (CNN) It was a wild night at CNN's GOP debate at the Reagan Library in Simi Valley, California, and it took a toll on Donald Trump as he sparred with Carly Fiorina and Jeb Bush and sustained attacks from just about everybody on the stage.

The odds of Trump winning the GOP nomination fell 8 percentage points to 12%, according to the Political Prediction Market from CNN and Pivit.

The Political Predict Market is a game run by the company Pivit that uses polls and other factors and input from players who weigh in on the increasing or decreasing chance that a candidate or party wins or loses an election.

Movement in the Political Prediction Market during CNN's GOP debate

Marco Rubio was the early winner, according to Political Prediction Market data collected during the debate. The odds of Rubio winning the GOP nomination rose 6 points to 15%.

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