Bottom line: Perry has yet to be vetted on the national stage. His candidacy helps Romney in 3 ways:1) Romney biggest threat was having to defend the top of the totem poll for the next 8 months. Now – he's the challenger. Perry has likely hit his high mark (or close to it). Perry is not king of the mountain and has to act that way or fail. Look back to 2008"
Perry’s Entrance Helps…. Romney — iHartPolitics.com
