While political outsiders Donald Trump and Dr. Ben Carson continue to lead the 2016 GOP field in the polls, attention is beginning to shift to a growing rivalry between two congressional Republicans: Sens. Marco Rubio (R-FL) and Ted Cruz (R-TX).
Rubio and Cruz are both serving their first terms in the U.S. Senate, having been elected with Tea Party support, and each now seeks to differentiate himself from the other. The tensions began when Cruz started taking subtle jabs at Rubio. The Texas senator has described himself as the conservative alternative to the "moderate" Rubio and, unprompted, bashed a sugar subsidy program Rubio supports in the last Republican presidential debate.
Now the two candidates have begun calling each other out by name. Here are three of the areas where the Cruz-Rubio battle lines are being drawn.
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