Donald Trump is still the GOP front-runner in opinion polls, but Texas Sen. Ted Cruz has seen a surge on CNN's Political Prediction Market, and is now seen by players as more likely than the billionaire businessman to be the Republican nominee. Cruz's odds -- which stand at 21% -- are greater than Trump's 20% odds for the first time, according to the Political Prediction Market, a live, online game, conducted by the company Pivit for CNN. It uses polling data and input from its 25,000 users to predict outcomes. Play the Political Prediction Market at cnn.com/Predict Movement on the...