The Year of the Multi-Million Dollar Agenda Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email U.S. Sen. Michael Bennet (D-Colo.), who is running against Republican Ken Buck. Bennet and Buck are the top recipients of funding from outside groups, according to OpenSecrets.org. ( Getty Images ) Produced by PRI and WNYC