Here is my compilation of what seem to be the basic beliefs of the 2012 Republican Presidential candidates. I divided this list up by the following five categories: abortion, the economy, health care, foreign policy, and marriage. This is by no means an exhaustive list.
The way chose things to list was to list only things about the candidates that differed from the other candidates. For example: repealing Obamacare. I do not say "would repeal Obamacare" because it's a given that Republican candidates would repeal Obamacare (or at least convince people they would). So I only mention repealing Obamacare if either 1) there was something unique about how/why a candidate would repeal Obamacare, or 2) if a candidate would NOT repeal Obamacare.
I gathered my information from various articles, debates, and the candidates' campaign website. If I did not list much about what a candidate believes under a certain topic, it isn't (usually) because I'm being lazy, but because I simply couldn't find anything unique or specific about that candidate under that certain topic...or I simply couldn't find much information. I also sometimes give links throughout the list that go to what I found very helpful/detailed articles about the candidate under that topic. Sometimes they are from candidates' websites, sometimes they aren't.
I did my best to not write biased, but I'm only human.