How do you know? You're taking it on faith.
I notice you dismiss Santorum outright but he's got a clearer record than some you hold up as "the real conservatives."
Cain's got a business record but there's no record on immigration and all these other issues to tear apart and examine. He's also got an obvious knowledge gap as we saw on the "right of return."
You don't seem the least bit troubled by Bachmann's exaggerations, missteps or inability to get an agenda moved forward. She says "never raise the debt ceiling" and signed a pledge to do the exact opposite. She's promising things like gas under $2 that only happened because of a financial meltdown. She's never explained taking farm subsidies or the farm income she denied getting but declared on her financial disclosure forms.
No one has explained her husband's degree from a school that wasn't offering that degree when he was there. She's talked about starting a charter school but leaves out that was promptly removed for trying to make that public school into a religious one. She's moved no major House legislation forward and uses as her one example an education bill when she was in the State Senate.
For all we know about Sarah Palin, we don't have a deep record to go on there either. With immigration, for example, we have her support for McCain's amnesty plans which she gets a pass on yet hasn't walked away from even last year. She's supported McCain in 2010 against the Tea Party candidate. She supported the reviled repugnant RINO Rick Perry in 2010 as well. She gets a pass. Delaying entry, missing debate after debate? She gets a pass.
With Romney we have a clear record of being everywhere on nearly everything. With Perry we have a huge long record with some bad stuff (as with Reagan too) which people are magnifying while ignoring any positives.
Do not fall into the trap Democrats did with Obama of taking on faith who and what the candidate was without a thorough review of their record. By the same token, don't hold it against a candidate because he or she has more experience and actually has a record for examination on an issue.
None of these candidates is perfect. I am bothered that Cain caved in to the Muzzie lobby. I am bothered with Bachmann’s fib about attending her family reunion. I am bothered by Palin’s endorsement of McCain. But none of these failings compares with the long string of completely anti-conservative positions taken by Slick Rick Perry: the Gore and Giuliani endorsements, the Gardasil maneuver, the Trans-Texas maneuver, the pandering to La Raza and CAIR, etc. I can’t see how any conservative can fall for this guy’s con game. He is not to be trusted.