Sam Nunberg, a former political adviser for Donald Trump, has endorsed Ted Cruz in the Republican primary, blasting his former boss for lacking a "coherent political ideology.""Cruz is a Reagan Conservative. Donald Trump does not have a coherent political ideology — if anything, I would describe him as a Chris Christie Republican," Nunberg said in a statement to POLITICO Playbook on Monday.-snip-"When did I decide that I could no longer support Trump? Last fall, when he did not have any idea of what the nuclear triad is in a debate. I was concerned but I figured that he would bulk...