Although stadium-packing rallies are nothing new for the Religious Right, the pushback to Perry's gathering—dubbed "The Response"—has been fierce. The problem isn't with separation of church and state; Perry's faith is no secret, and he's made it clear that he will be attending the event as a private citizen and not in his official capacity as governor. The controversy, magnified by the governor's escalating flirtation with a presidential bid, stems mostly from the company he's keeping. Perry has left the organization and the funding for the prayer rally up to a handful of key sponsors—groups like the American Family Association (which the Southern Poverty Law Center considers a "hate group") and the International House of Prayer (the other IHOP). Those organizations created a monster: In interviews, the event's planners have conceded that the non-Christians will not be allowed on stage, and that the event—which Perry says is open to everyone—is intended in part to convert people to Christianity.
Although Perry and his defenders say he's the victim of guilt by association ("Just because you endorse me doesn't mean I endorse everything that you say or do," he told the Dallas Morning-News) they're missing a key point: By tasking these groups with running the event, Perry endorsed them.
This would be akin to Candidate Obama having Jeremiah Wright or Bill Ayers run his campaign stops, and that's only if Ayers or Wright were as absolutely insane as possible to openly say stuff like the 9/11 attacks were punishment for allowing homosexuality and same-sex marriage in the US, that groups of birds dying last summer was because of DADT, that invisible things live in your clothing to remind you of your sinning, that Democrats are the "network of wicked forces" working for Satan, that gays are just like Nazis, that Glee is evil, that orcas and grizzlies should be destroyed(!), that the gay Illuminati are running America, that the feds are trying to mind-control the country with implanted RFID chips, that Muslims are too inbred and stupid to serve in our military, that Oprah Winfrey is the herald of the Antichrist, that secession from America is a good idea, that the Statue of Liberty is a graven idol, and that Japan was smote due to their weird sun goddess worship.
And all of those insane things are documented in Murphy's article in the link there at the top.
So no, I don't think Rick Perry is running for President. (But if he does, it's going to be a hoot.)