Well, at least you do see a constitutional issue. The only reason the federal government has money is because we, the individual citizens, give it to them. The federal government has the authority to collect taxes to raise the funds necessary to perform it's functions. The question becomes, is bribing the states to enact particular laws or policies a valid federal government function, and are they justified in taking the lion's share of the available resources to that end? I also don't understand why opposition to any program or law aimed at drug abuse is automatically seen as a libertarian "pro-drug" position. Is there some unwritten rule that says if it involves drugs, the end justifies the means?
No, or course not. But the fact is (marijuana aside) that drug use terrifies a great many (obviously not all) parents. I've seen first hand the destruction that drugs bring to kids and to communities. I've seen the death on the roads caused by kids using drugs. I KNOW it's a serious danger to my kids - and I KNOW there are lots of evil people (right in my town and in my kids' schools) who would love for my kids to get hooked on powerful and dangerous drugs. Dole (though wrong consitutionally) is talking to the many, many parents terrified by what drugs can do to their kids.