Dewhurt supporters are not likely to switch candidates.
He has the lead in the polls
Dewhurst supporters might also be Perry supporters and would think highly of a Perry endorsement. I personally think he's a halfwit and give his word ZERO weight. But that's just me; I think logically.
Fact is, I don't know if Dewhurst supporters would switch their support and neither do you. One thing is certain, Perry's support of the non-TEA Party candidate serves to support my claim all along that he is no TEA Party conservative.