"'Judgment is mine,' saith the Lord." Or so the story goes. But if I were the Lord, here's how I'd feel. I could consider forgiving Franklin D. Roosevelt for allowing his Treasury department to kill the hemp industry in America, 'cuz, hell, a guys gotta watch out for his friends in the fabric and banking industries. (for more on this: http://www.hemphasis.net/Politics/politics.htm)
I could consider forgiving Harry Truman, D. D. Eisenhower, JFK, and even LBJ, for not reversing that course, and for, in fact respectively increasing the strictures on cannabis and penalties for possession thereof. It'd be hard, but I'd consider it.
Now it gets really hard to start considering forgiveness. Nixon? Ford? Carter (well, that's not so hard)? Reagan? Bush? Clinton? Bush 2? In succession, each of these folks except Carter oversaw a progression of injustice in legislation, arrests, and prosecution of people for trying to feel better. If these people begged forgiveness I might forgive them after making 'em spend a few light years in purgatory. They, at least, said they were going to punish people for trying to feel better.
Here's where I might draw the line. Barack Obama is a man who knows cannabis. He should know what devastation its prohibition is causing. He promised to stop prosecuting people for trying to feel better in states where it's legal to try to feel better. His Atty Genl reiterated the promise. They, in fact, increased arrests for simple possession, and unleashed an unprecedented plague of federal prosecutions in states where attempting to feel better is legal. Burning in hell for eternity seems like light punishment to me.
The question is not how I can refuse to vote for him because of that. The question is, "How could you vote for him in spite of that?"