The Wall Street Journal reported yesterday that Sen. Herb Kohl (D-WI) will put a hold on the nomination of Michele Leonhart to be the next administrator of the DEA. Kohl's beef with Leonhart has nothing to do with her views on marijuana issues, but rather the DEA's work in restricting access to certain prescription pain medications in nursing homes. Still, this represents the strongest opposition to date against Leonhart, who is currently interim DEA head and has played a crucial role in overseeing…