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.

Related: Play the Political Prediction Market

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%.

Carly Fiorina also rose by 2 points to 16% odds and Jeb Bush rose by 1 point to 18% odds to win the GOP nomination. Bush currently has the best odds, but not by much.

Retired neurosurgeon Ben Carson had been nipping at front-runner Trump’s heels in recent opinion polls. But the odds of a Carson nomination went down by 4 points during the debate, according to the calculation.

The first debate saw some major movement on the Political Prediction Market from CNN and Pivit. The odds of former New York Gov. George Pataki dropping out of the race by Nov. 1 went up 15 percentage points to 55% odds, according to Pivit. The other candidates on the market did not see nearly that amount of movement.

Related: Get up to speed on everything you missed at the CNN GOP debate