If Rick Perry runs away with the nomination, all three Morris enterprises are adversely impacted. He needs a horse race to remain relevant.
That being said, Perry shot himself in the foot with his stubborn defense of illegal immigration incentives. And Romney appears to be the main beneficiary.
See:
Perry defends incentives for illegal immigrants in Texas.
Texas Tea Party to Rick Perry: 'We are Fed Up!"
Texas Tea Party activists to Perry: Hey, what about our borders?
Now, had the topic been ObamaCare/RomneyCare, you would have seen Perry pick up ground.