I do not think that all drugs should be legalized either, I see a big difference in hard narcotics compared to a little herb. It's just my personal opinion because I don't think that Pot hurts anyone whereas some of the other drugs can definately put you in the hospital or kill you, but I don't think that it makes me or this fella a hypocrite.
If your argument is that pot should be legal because it's not as harmful as other drugs, then, no, you are not a hypocrite. But if that's the only reason, I don't think that people will be motivated to vote to make a change from the status quo.
Now if you were to argue that pot should be decriminalized because it's not as harmful, or dangerous, or habit forming as other drugs, that might fly.