Marco Rubio's addition of Marc Short, a top political adviser to the Koch Brothers, to his campaign signals the start of ramped up efforts to attack front-runner Donald Trump. | AP PhotoSource: Koch brothers’ D.C. guru joins Marco Rubio team
Marco Rubio's addition of Marc Short, a top political adviser to the Koch Brothers, to his campaign signals the start of ramped up efforts to attack front-runner Donald Trump. | AP PhotoSource: Koch brothers’ D.C. guru joins Marco Rubio team
