His suddenly joining the NRA on the eve of his annoucement for the Presidency is a recent example of what would appear to be actions based on political pundits advise as opposed to true conviction.
As a result, with Romney, I prefer to wait a good while...perhaps years...before judging for myself that these new found pronouncments are genuine and not made out of political expediency. They are too important, IMHO, to risk to any other course.
In the mean time I will trust the track records and firm commitment to those principles of others, who are also Christian, like Hunter and or Thompson.
Now, if it came down to Romney or Rudy (and I will work to try and ensure it does not come down to that choice), then I would pick Romney over Rudy because Romney may well be changing on these issues when I know good and well that Rudy is not.
Bullseye.