I should be fired.For the past four years, I have tried to convince my party and my president to embrace marijuana policy reform. It should have been easy. After all, it is consistent with our core beliefs of freedom, individual liberty, personal responsibility, and federalism. But I failed. I know from personal experience as a former legislator who was the original lead sponsor of my state’s first medical marijuana law that drug policy advocacy by a Republican is not the third rail everyone reflexively…