Republican Texas Gov. Rick Perry, booked on abuse of power charges Tuesday, is pressing forward after a criminal indictment with a smiling mug shot and an ice cream run.

Perry, who is mulling a second presidential run in 2016, was indicted after carrying out a threat to veto funding for state public corruption prosecutors. He has long called the case a political ploy, and supporters chanting his name and holding signs — some saying "Stop Democrat Games" — greeted him when he arrived at the Travis County Courthouse in Austin.

"I'm going to fight this injustice with every fibre of my being. And we will prevail," Perry said before walking inside the courthouse, where he set off a metal detector but didn't break stride as he headed toward an office to have his fingerprints and mug shot taken.

The photo shows Perry with a thin smile and without his black-framed glasses.

The longest-serving governor in Texas history was indicted last week for coercion and official oppression for publicly promising to veto $7.5 million US for the state public integrity unit, which investigates wrongdoing by elected officials and is run by the Travis County district attorney's office. Perry threatened the veto if the county's Democratic district attorney, Rosemary Lehmberg, stayed in office after a drunken driving conviction.

Image | Rick Perry-booking-photo-Texas

Caption: Rick Perry, in his booking photo on Tuesday. (Twitter)

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Lehmberg refused to resign and Perry carried out the veto, drawing an ethics complaint from a left-leaning government watchdog group.

Perry was indicted by a grand jury in Austin, a liberal bastion in otherwise fiercely conservative Texas.

"I'm going to enter this courthouse with my head held high knowing the actions I took were not only lawful and legal, but right," Perry said in brief remarks before going inside the courthouse.

In less than 10 minutes, Perry was outside again, telling his supporters that he was confident in the rule of law.

"We don't resolve political disputes or policy differences by indictments," he said. "We don't criminalize policy disagreements. We will prevail. We will prevail."

But he isn't letting the case keep him from a packed travel schedule that will take him to the early-voting states of Iowa, New Hampshire and South Carolina over the next two weeks. After his 2012 presidential campaign flamed out, the Republican opted not to seek re-election as governor in November — leaving him more time to focus on rehabilitating his image nationally.

If convicted on both counts, Perry could face a maximum 109 years in prison — though legal experts across the political spectrum have said the case against him may be a tough sell to a jury. No one disputes that Perry has the right to veto any measures passed by the state Legislature, including any parts of the state budget.

But the complaint against Perry alleges that by publicly threatening a veto and trying to force Lehmberg to resign, he coerced her. The Republican judge assigned to the case has assigned a San Antonio-based special prosecutor who insists the case is stronger than it may outwardly appear.

Perry has hired a team of high-powered attorneys, who are being paid with state funds to defend him.

Perry is the first Texas governor to be indicted since 1917. Top Republicans have been especially quick to defend him, though, since a jail video following Lehmberg's April 2013 arrest showed the district attorney badly slurring her words, shouting at staffers to call the sheriff, kicking the door of her cell, and sticking her tongue out. Her blood alcohol level was also three times the legal limit for driving.