[...] with eight months left on the job and a decision to make about the 2016 presidential race, the long-serving governor known for his Texas swagger is now the focus of a grand jury investigation that could cause more difficulty than any adversary has. A judge seated a grand jury in Austin this week to consider whether Perry, who is weighing another run for the White House, abused his power when he carried out a threat to veto $7.5 million in state funding for public corruption prosecutors last summer. The state Public Integrity Unit operates under Travis County District Attorney Rosemary Lehmberg, a Democrat who has been the subject of Republican grumbling that the office investigates through a partisan lens. Craig McDonald, whose public watchdog group filed a complaint that a Texas judge took seriously enough to hire a special prosecutor, said the veto embodied a brash governor who's gotten too accustomed to dictating to others. The public corruption unit, which prosecuted former Republican U.S.