A very realistic concern, in my opinion.
To make my position clear at the outset: I'm in Texas, I won't support Perry in the primary but I will support him if he's the nominee.
Understand that Perry is NOT a "conservative". He is a "conservative politician". The difference between conservative as a noun and conservative as an adjective is important.
In Texas, a conservative state, Perry had to be campaign as and govern as a "conservative politician" in order to succeed. Elected to national office, he may well prefer to govern as "some other kind of politician".
You get it. Comparing Perry and Goldwater - Goldwater was the real deal (and decidedly not ‘slick’). Perry has a cheesy greathair slickness about him that I just don’t trust. His positions shift with the wind. Like someone else said, ...waiting for Sarah.