On Tuesday, Perry planned to stream a webcast of his announcement from San Antonio. Instead, many users got a message saying "unable to connect to database server". At the time, campaign spokesman Mark Miner called it a denial-of-service attack.
FBI spokesman Erik Vasys told the AP that "The FBI confirms that it is conducting a preliminary inquiry into the possibility that an intentional intrusion was conducted on the governor's computer from out of state. The FBI considers this a hacking event with unknown origin at this time."

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Sounds more like they just couldn't keep up with all the streaming content, and are pointing fingers at "hackers" to cover their mistake.
If it was a distributed DOS attack, why bother looking at the governor's computer?