That doesn't mean Perry wont take a pot shot at Cain every now and then when given the opportunity, but I can't see him ever going after Cain with the same venom he has been going after Romney. With Romney, it's personal.
“When I see Perry look at Romney I see seething hatred in his eyes”
Well, but what the facts show is that Perry and Romney are old buddies. Romney helped fund Perry’s campaigns in Texas:
http://m.yahoo.com/w/news_america/mitt-rick-secret-donor-deal-032600837.html
We’ll see how this develops, but I’d bet money that Perry will launch a blitzerkrieg against Cain when the time comes. His phony campaign against Romney is all about misdirection and he is doing no real damage.
You and I are seeing the same thing! Even his look towards Cain is gentler - you can see it change when he focuses back on Mitt with one of Mitt’s attacks. Mitt needs to work on his acting skills because he makes things obvious - he attacks Perry but not Cain. And Cain is passing him in the polls.