The thread is largely missing one important part of the story, lets rehash through it...
The Travis County DA Rosemary Lehmberg works in Texas's Public Integrity Unit - essentially a part of the Texas Government that's solely purpose is to look for corruption with-in Texas.
As you probably already know, Lehmberg was convicted of driving drunk and acting extraordinarily unprofessional during her arrest. Once it become public, Rick Perry demanded she resign and if she didn't - he'd veto funding for the organization. She didn't resign and he veto'd funding.
Why didn't she resign, because the Public Integrity Unit was investigating CPRIT. The organization grants public funds for cancer research but something fishy was going with whom received the money. They found out that an exec was picking favorites on who got the donations. Who got the donations? Groups/people with ties to Rick Perry. That exec has been indicted and resigned.
If Lehmberg has resigned, Perry would have been able to appoint whomever he wanted into the Public Integrity Unit and kill the investigation.
The argument is that Perry used Lemberg's DUI as cover to save his buddies but that's hard sell in court. Here's the kicker - supposedly Perry went behind closed doors and told Lemberg if she didn't fight him he'd find her a job someplace else.
If they could prove it in court, Perry will undoubtedly be found guilty. Last but not least Lehmberg is an elected official who's responsible to Travis County so Perry killing her funding doesn't really play out...