It's a congressional scorecard so it is based off votes they have taken. While legislators get additional points for co-sponsoring positive pro-liberty legislation the votes are still the bulk of the score. Because the Senate held up most of the pro-liberty policies in committee, in particular...
I'm not 100% sure about what Mike Lee does or does not support but the scorecard is based on what votes were cast or available. Since the senate keeps a lot of liberty votes from going to the floor they can't be scored and so it is harder to nail down someone's position through votes alone. The...
It's not a direct statement that he won't run, but when asked Carson didn't seem too interested in the idea.
The Detroit News ran the article, it's titled "Neurosurgeon won't run for Levin's Senate Seat" - I would link to it but it won't let me until I have three posts.