Republican presidential front-runner Donald Trump is going after Glenn Beck for throwing his support behind GOP primary rival Ted Cruz, calling the conservative activist a "wacko" and a "lost soul." Trump also said his endorsement from former Alaska Gov. Sarah Palin trumps Cruz's endorsement from Beck. "Wacko [Glenn Beck] is a sad answer to the [Sarah Palin] endorsement that Cruz so desperately wanted," Trump said in a tweet on Thursday. "Glenn is a failing, crying, lost soul!" Beck announced on Tuesday that he would campaign with Cruz on Saturday in Iowa. A longtime opponent of Trump, the Tea Party icon...