I am not an expert on campaigning or politics, but this just doesn't bode well for Hillary Clinton. It is 10 months and 22 days to the General Election and I don't think she wants to go so negative so fast.
See Clinton N.H. Official Warns Obama Will Be Attacked on Drug Use
I guess the very unsubtle slight of hand here is that Hillary isn't raising the drug issue, just pointing out that the Republican opponent will raise the drug issue. This kind of doesn't work if you think about President Clinton's past history.