This has been tried before. In fact, a federal judge recommended, to the DEA, that marijuana be rescheduled.
Erowid Cannabis Vault : Francis L. Young Ruling - Index
That's the full report of the judge's findings. This was back in 1988. As much as I would like to see this happen, the more I research people's previous attempts, the more discouraged I become.
BTW rescheduling really wouldn't do much, and it is not what we should be aiming for. While I know that the medical approach to the legalization of marijuana is seemingly the easiest road, rescheduling marijuana to Schedule 2, for instance, would put it in the same category as Cocaine, Opium, and Amphetamines. We need complete legalization.
We need the government to realize that marijuana is a harmless intoxicant that can be used responsibly by consenting adults. It is a much safer alternative to tobacco and alcohol, which have been legal for years. And we need to make it clear that is absolutely ridiculous that billions of our tax dollars go to fighting a useless war against this amazing plant, which only incarcerates hundreds of thousands of otherwise law-abiding citizens, costing even more tax dollars, when it should be used as a revenue stream instead.