I'd rather debate on substance, even though retail politics is a game of style.
I think the reason Palin hasn't entered is that she believed Perry when he said he wouldn't: and hasn't yet prepared for him.
I also think that advisor of Perry's (the one who's a slimebag, and fat, and six-foot-four) has carefully studied Palin and adopted many of her positions *and* techniques: and Palin had been relying on that as her differentiator to lend credibility to her candidacy without a large set of $$$ backers).
But she's absolutely determined: and after the contretemps with the Perry fan and the on-again-off-again invitation of Christine O'Donnell, she's planning very carefully exactly *where* to land her torpedo to sink Perry with a single shot.
(She's faced far worse than a swaggering redneck bully in the last three years: and Perry is relying on the shock and awe of an astroturf blitzkrieg to promote an air of inevitability, backed by Te-hey-ax-ayns from all over chiming in, in a well-executed version of the Diamond Strategy. But it's all just astroturf: pandering to Mexicans will SINK him no matter what he claims about Texas and its economy. Texas as a state is as narcissistic as Obama is about himself: and Texans aren't quite bright enough to figure out, or honest enough with themselves to admit, that nobody else worships them in quite that same special way.)
Here's a photo from Texas A&M as published in The Texas Tribune which will cause trouble for Perry in the proper hands:
From Animal House to Storm Trooper in one easy lesson.
Cheers!