Lt. Gov. David Dewhurst, right, fist bumps Jason Carter at a deli Tuesday, July 31, 2012, in Houston. Dewhurst faces former Texas Solicitor General Ted Cruz in the Republican primary runoff election for U.S. Senator. Carter had jokingly handed Dewhurst his lunch tab and Dewhurst quickly gave it back. (AP Photo/Pat Sullivan)

Associated Press
Lt. Gov. David Dewhurst, right, fist bumps Jason Carter at a deli Tuesday, July 31, 2012, in Houston. Dewhurst faces former Texas Solicitor General Ted Cruz in the Republican primary runoff election for U.S. Senator. Carter had jokingly handed Dewhurst his lunch tab and Dewhurst quickly gave it back. (AP Photo/Pat Sullivan)
Lt. Gov. David Dewhurst, right, fist bumps Jason Carter at a deli Tuesday, July 31, 2012, in Houston. Dewhurst faces former Texas Solicitor General Ted Cruz in the Republican primary runoff election for U.S. Senator. Carter had jokingly handed Dewhurst his lunch tab and Dewhurst quickly gave it back. (AP Photo/Pat Sullivan)
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