Dave Davies gives a live update from the Trump rally at West Chester University. Katie Colaneri heads to south Philadelphia, where John Kasich met with supporters. Bernie Sanders makes his way to Philadelphia after stopping in the Pittsburgh area. Chelsea Clinton joins the show to discuss how believes her mother’s campaign speaks to voters in the area. Dave Heller speaks with Chelsea Parsons, vice president of guns and crime policy from the Center for American Progress, and Adam Bates, policy analyst for the Cato Institute project on criminal justice. He got a preview of a debate on gun control they’ll be speaking at. Laura Benshoff heads to Bucks County, where two candidates in the race for a congressional seat are going negative with their campaigns. In this week’s edition of SkyTalk, Dave Heller talks to Derrick Pitts, chief astronomer at the Franklin Institute, about the private sector’s entrance into space exploration.