Gary Johnson, the Libertarian Party candidate for president, addresses an audience of students and the public at Macalester College, Friday, Sept. 21, 2012 in St. Paul, Minn. Johnson, a former two-term New Mexico governor, is on a nationwide college tour as part of his campaign for president. (AP Photo/Jim Mone)

Photo by: Jim Mone

Gary Johnson, the Libertarian Party candidate for president, addresses an audience of students and the public at Macalester College, Friday, Sept. 21, 2012 in St. Paul, Minn. Johnson, a former two-term New Mexico governor, is on a nationwide college tour as part of his campaign for president. (AP Photo/Jim Mone)