The Democratic Party presidential candidates will hold a two hour long debate Saturday starting at 9 p.m. EST, 6 p.m. PST at Drake University in Des Moines, Iowa. The debate will be broadcast by CBS News and can be viewed on over-the-air CBS television and radio affiliates as well as various online streaming sources. The candidates: Former Gov. Martin O'Malley of Maryland, Sen. Bernie Sanders of Vermont and former Secretary of State Hillary Clinton of New York. Co-hosting the debate are CBS News, the Des Moines Register and CBS affiliate KCCI-TV. Debate moderator: CBS News Face the Nation host John...