To throw my two bits into the ring, I don't agree with Ron Paul on quite a few issues, but I voted for him anyway. Reason? He's the closest thing to a true Constitutionalist that has been in the running for POTUS in a long time. Even though I think his foreign policy positions are maybe a little less than practical, his domestic issues line up with mine in most particulars. We so desperately need someone who would actually rein in governmental extremes, spending and intrusions that I would have rather had Ron Paul than anyone else who ran.
Not to mention, he's the closest thing to an honest politician I've seen in a while also.