Make Mine State

By Janice Castro

As he basks in the glow of a wildly successful Democratic convention, party chairman RON BROWN is contemplating what to do when his four-year term expires later this year. Friends say he's hoping for a Cabinet post in a Clinton Administration. But which one? A source close to both Brown and Clinton maintains that Brown wants to start at the top, as Secretary of State, though that might be aiming a bit high. Among his possible successors at the D.N.C.: Tony Coelho, the former House whip who resigned from Congress in 1989 amid questions regarding his use of campaign funds, has reportedly been hinting around about the job for months.