Byron York of The Washington Examiner writes late last night that Texas Gov. Rick Perry finally showed up for the most recent Republican debate in Las Vegas. Whether it’s enough to revive Perry’s campaign is another question.

The exchange between Perry and former Massachusetts Gov. Mitt Romney over illegal immigration was particularly testy:

Perry, for the first time in any GOP debate, rattled former Massachusetts Gov. Mitt Romney. He did it by bringing up a 2007 charge that Romney hired illegal immigrants to do lawn work at his Massachusetts home. Jobs are the magnet for illegal immigrants, Perry said. “And Mitt, you lose all of your standing, from my perspective, because you hired illegals in your home and you knew about it for a year. And the idea that you stand here before us and talk about that you’re strong on immigration is on its face the height of hypocrisy.”

Romney tried to laugh it off and to deny the story. “I don’t think I’ve ever hired an illegal in my life,” he said. Romney tried to explain, but Perry kept pushing, leaving Romney protesting that Perry was ignoring the rules — just as Perry had planned.

“Rick, again, Rick, I’m speaking,” Romney said. “I’m speaking, I’m speaking, I’m speaking. You get 30 seconds. This is the way the rules work here…Anderson?”

By the time Romney appealed to CNN moderator Anderson Cooper for help, Romney seemed flustered, almost frantic. “Would you please wait?” he said to Perry. “Are you just going to keep talking?”