That doesn't mean he's wrong about this. It only stands to reason Perry would try to take out Cain. You go after the guy who's got the voters you want. And you go after the guy who's apparently got less money than you do.
The article makes perfect sense whether the writer is for Romney or not. Full disclosure: I support Cain, but that doesn't change my opinion of Perry's likely strategy.
By the way, do you think the new Perry flat tax idea is designed to take out Romney?