For the two Republican U.S. Senate runoff candidates, who have been running against each other for almost a year, the question directed at them during last week's televised debate could not have been more straightforward. 

Lt. Gov. David Dewhurst and Ted Cruz, the former state solicitor general, were each given 30 seconds to identify an issue that
could come before the Senate on which they would vote differently.

A minute later, neither had identified an area of disagreement.

Allan Saxe, an associate professor of political science at the University of Texas at Arlington, said that considering how contentious ...

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