Supreme Court rulings - Gun "use" in drug deals

I found this entry at Wikipedia very interesting. The Supreme Court, in one case (Smith v. United States), found that trading an automatic weapon for cocaine constituted "use" of a firearm in a drug deal; but in Watson v. United States, receiving a firearm in a drug trade was not considered "use."

In Watson, Justice Ginsburg was in the majority. Quoting from the Wikipedia entry: 

Her reasoning is that she defines the word “use” to mean using as a weapon and not in bartering transactions. She also goes on to state that she would overrule Smith, 508 U.S., at 241, and make the precedent both “coherent and consistent with normal usage.”