Policy over the last several years has given civil libertarians a lot to be unhappy about. I don't know how many of them are willing to trust presidential candidates' promises at this point, but it looks like there's going to be a lot of support in the Democratic primary for anyone who can make credible promises to them on these issues. (What makes someone credible here? I guess if they've meaningfully contributed to better outcomes on these issues, or if they've been speaking out on them for a long time.) I could see some candidate pledging to pardon Bradley Manning. While I don't understand the dynamics over there quite as well, it's also possible that you'd see some kind of similar action on the Republican side too, perhaps from Rand Paul or someone trying to absorb the Ron Paul constituency. I don't see it taking a Bradley Manning-related shape, though, since Rand doesn't seem to like him very much.