The Volokh Conspiracy has an interesting roundup of presidential primary endorsements from "libertarianish" law profs. Biggest surprise for me was former FEC chair Brad Smith's full-throated libertarian case for … Mitt Romney. The pro-Paul position is manned by David Beito and Scott Horton. And, humorously enough, the Volokh-in-Chief says: "We tried contacting someone we know who supports McCain, but didn't hear back from him, nor did we hear back from the campaign when we e-mailed them to ask whether they could recommend someone (though we'd then have to figure out whether that someone matches our criteria)."
This bit from Smith jumped out:
Libertarians must understand that the Democratic nominee is going to be committed to a substantial growth in government[.]
Smith's 2005 reason piece attacking McCain's "war on political speech" can be found here.