CNN, Facebook to Host Final 2015 GOP Debate Tonight

MarketWatch: The Republican presidential candidates are gearing up for their final debate of 2015 on Tuesday night, as Donald Trump keeps his No. 1 standing in national polls but is increasingly under threat from Ted Cruz. The GOP hopefuls will take the stage in Las Vegas, for the fifth Republican debate of the primary season. CNN and Facebook are hosting and coverage begins at 8:30 p.m. Eastern.