Ted Cruz is further cementing his spot in the top tier of the Republican presidential field after doubling his support among GOP voters since October, according to a new poll. Donald Trump maintains a steady lead over the Texas senator and the rest of his opponents. The latest Public Policy Polling survey released Thursday shows Cruz at 14 percent support among the GOP electorate, putting him in third place behind Trump (26 percent) and retired neurosurgeon Ben Carson (19 percent), and just ahead of Florida Sen. Marco Rubio (13 percent). Cruz, who ranks second in the Washington Examiner's presidential power...