mr. johnson is a plastics company owner with no previous experience in public office. rob portman is also drain the senate, replacing george voinovich mr. corbett had been president bush's budget director, u.s. trade representative, and a member of the u.s. house. >> this week marked the 47th anniversary of the assassination of president kennedy. this weekend, we will talk with troubling and kent hill, secret service agents whose job was to protect the president on that day. we will talk about the conspiracy theories and mr. blaine's new book. >> the c-span network provides coverage of politics, public affairs, nonfiction books, and american history. it is available to you on television, radio, online, and on social media networking sites. find our content any time through c-span video library. we take c-span on the road with our digital bus local content video. it is washington your way, the c-span networks, now available in over 100 million homes. created by cable and provided as a public service. >> can politics be civil? democratic strategist donna brazil and what the crowley tried to enter that question this afternoon. in a pan