The Nation‘s John Nichols (12/20/15) cites FAIR:
As groups such as Media Matters and Fairness & Accuracy In Reporting have made clear, the Democratic race is getting less media attention than the Republican race. The attention paid Clinton, Sanders and O’Malley, in combination, has been dramatically less than the attention paid one Republican—billionaire Donald Trump. Even also-ran Republicans like former Florida governor Jeb Bush have enjoyed far more television time than Sanders and O’Malley and, of late, second- and third-tier Republicans have grabbed more of the spotlight than Clinton.
Source: Fair.org No Spin Section