Utah Sen. Mike Lee plans to endorse Ted Cruz Thursday, making him the first U.S. senator to back the Texas senator's presidential bid, sources told POLITICO. In a blow to Marco Rubio, whose campaign is on life support as he seeks to avoid a knock-out blow in his home state Tuesday, Lee is expected to make the announcement in Rubio’s hometown of Miami ahead of Thursday night’s GOP debate.-snip-Lee is close with both senators, and he had resisted jumping into the race and potentially alienating one of them. He sat down with Rand Paul, Rubio and Cruz as the presidential...