If Lt. Gov. David Dewhurst wins his bid to replace Senator Kay Bailey Hutchison, he will leave a job he has had for nearly 10 years — longer than all but two other lieutenant governors in Texas history.

The position, held by such legends as Bob Bullock and Bill Hobby, is often described as the most powerful seat in Texas government. Dewhurst’s tenure has drawn a mixed appraisal: he has presided over the passage of dozens of major bills, but critics said that, when push came to shove, his political aspirations weakened his resolve.

“He has a humble persona and ...

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