>> 2012 libertarian nominee gary johnson joined booktv at freedomfest in las vegas. he talked about his new book, "seven principles of good government." this is about 15 minutes. >> on your screen is the cover of a new book coming out august 2012, "seven principles of good government," liberty people in politics and is written by former new max are grew governor gary johnson and he is also the libertarian party nominee for president in 2012. governor johnson, when and why did you leave the republican party and become a libertarian? >> will you know i have probably been a libertarian my entire life so this is kind of coming out of the closet and i don't think i am unlike most americans. i think there are a lot more americans in this country that declare themselves libertarian as opposed to voting libertarian. so you know the pitch that i'm trying to make right now is vote libertarian with me just this one time. give me a shot at changing things and if it doesn't work out you can always return to tyranny. i'm going to argue that is what we have right now. >> what are t