Republican Scott Jennings tried to argue Wednesday that nobody at the Democratic National Convention has voiced a clear policy and instead expects voters to react to vague concepts such as “joy.” He got immediate pushback from CNN’s Anderson Cooper. Jennings was reacting to ex-Barack Obama aide Van Jones — and co-panel member on the network — who gushed with enthusiasm over Tim Walz’s closing speech as the Minnesota governor accepted the vice presidential nomination. Want more breaking political news? Click for the latest headlines at Raw Story. “Nobody said anything, nobody tonight said a dam…