Marijuana legalization: Did Obama's "pot cheat sheet" kill California's Proposition 19?

Why did Proposition 19, the CA pot legalization measure, fail? One reason might have been Obama administration antagonism exemplified by the memo "Marijuana legalization: A bad idea." As Colorado begins the march to a 2012 legalization measure, let's see if Obama's "pot cheat sheet" holds up to scrutiny.
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Joel Warner is a former staff writer for Westword and International Business Times. He's also written for WIRED, Men's Journal, Men's Health, Bloomberg Businessweek, Popular Science, Slate, Grantland and many other publications. He's co-author of the 2014 book The Humor Code: A Global Search for What Makes Things Funny, published by Simon & Schuster.
Contact: Joel Warner