Do you trust someone who has exhibited a life long record of supporting liberalism, or do you trust someone who has spent a life time supporting conservatism? Do you trust someone who has taken multiple positions on the critical issues of our time, or do you support someone who is consistent on all the issues.
I trust Fred Thompson. Of the top five candidates, Fred is the one true genuine conservative running for the nomination.
When it comes down to conservatism, the rest are a bunch of phonies and frauds.
On immigration issues, particularly, I can understand why a candidate would change their mind. There has been a lot of statistical evidence collected and disseminated over the last few years, via NumbersUSA, etc., that was not readily available before. Just knowing how adamantly the public opposes amnesty, and benefits for illegals, would also be a legitimate, and acceptable, reason for changing political stance.