Matt Welch sums up why libertarians (true capitalists, true levellers) believe that McCain is an unphilosophical old douchebag, here. The link was brought to you by FORA TV, an often excellent online media source. http://fora.tv/
Sarah Palin endorses jury rights here, and is in turn endorsed by Frank Turney, Alaska's foremost jury rights activist. This, along with Palin's support of gun rights as an individual right, makes her the most libertarian mainstream candidate, although she still sucks (and is totally inconsistent) compared to Wayne Allyn Root, the Libertarian Party's Vice Presidential candidate.
The Libertarian Party's candidate Bob Barr unfortunately has long opposed jury rights, as a drug warrior, prosecutor, and ex-congressman. As recently as 2007, he wrote in philosophical opposition to jury rights, regarding the Yates Jury. (if you follow the link to the Yates jury article, the part to pay close attention to is in the 4th paragraph. Juries are not constitutionally bound to obey judge's instructions if it violates their own conscience or code of morality. Noone is legitimately asked to give up their morality by any judge, according to the US Constitution, but that is exactly what judges who ask jurors to enforce unjust laws, or enforce laws unjustly are demanding. Note that all US juries --according to Kriho Vs. the State of Colorado-- still retain the legal authority to ignore the judge's instructions.)