Texas Lt. Gov. David Dewhurst, a Republican candidate for the Senate, visits a restaurant in Houston on Tuesday, the day of the primary. Mr. Dewhurst touts his experience in the Air Force, the CIA and in business. (Associated Press)

Texas Lt. Gov. David Dewhurst, a Republican candidate for the Senate, visits a restaurant in Houston on Tuesday, the day of the primary. Mr. Dewhurst touts his experience in the Air Force, the CIA and in business. (Associated Press)