In this June 12, 2012 photo, Trish Nixon, left, stands with her 21-year-old daughter, Krista Nixon, in Colorado Springs, Colo. Trish Nixon talks about the challenge she has faced over the years about marijuana. Nixon said the message to her daughter changed over the years, evolving from "It's against the law, don't do it," to a more nuanced message that takes into consideration medical marijuana and ballot initiatives to legalize the drug. Trish Nixon said her mother's message meshed with what she was learning through her friends, which included some who used marijuana. (AP Photo/P. Solomon Banda)