The "True" conservative?

Who is the true conservative in this race for the party nomination? Is that a good thing? As of right now, Thompson has come out ahead of the game in this respect. Thompson has had questionable choices in the past for this title such as fighting for the right to have an abortion, etc. However, his opponents such as Giuliani and McCain have much larger stains on their records such as Romney's choices in giving money to democratic candidates in the past and even voting for a democratic president. These sort of issues are appearing on the stage and while Thompson has some faults as well they are minimal compared to those the other candidates have hidden in their closets. This has allowed Thompson to pull ahead in the race to be the next Ronald Regan.