A caller on C-SPAN’s morning show explained that she had left the Republican Party because its lawmakers “do nothing but interfere” and “endorse everything [Donald] Trump does.” During Wednesday’s Washington Journal program, a caller from Maryland named Mary said she used to be a Republican but changed her party affiliation to Independent. “The reason I’m calling is to just say that anybody voting for a Republican is voting against their best interest,” the caller announced. “Republicans are threatening Social Security and Medicare, which is going to affect millions of people, including us, wh…