POWER RANKINGS: It's now Rubio vs. Cruz

Ben Carson and Donald Trump still stand atop the polls, but Marco Rubio and Ted Cruz are now the front-runners. Cruz and Rubio both debated brilliantly, and Jeb Bush failed to turn things around.
There's a trend here: The strong showing of fresh-faced first-term senators in their 40s shows a real readiness for change - a fact also evidenced by the poll dominance of outsiders Carson and Trump.


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