The contested primary was the result of a long-standing feud among Kentucky Democrats.
Mr. Mazzoli, a 61-year-old Kentucky Democrat, is leaving Congress at the end of this term.
William Natcher, a Kentucky Democrat, is the undisputed champ.
Lieutenant governors customarily break ties in state senates, and so Kentucky Democrats might have appeared assured of keeping a one-vote edge.
It was the first time Clements had lost a race in thirty years, and Kentucky Democrats would not elect a senator again for another sixteen years.
Senator Wendell Ford, a Kentucky Democrat who was a chief sponsor of the measure, vowed to reintroduce the bill in the next session.
Senator Wendell H. Ford, a Kentucky Democrat, said it would lead to reduced smoking and cause great harm to his state's economy.
A possible compromise was offered today by Senator Wendell H. Ford, Democrat of Kentucky.
Senator Wendell H. Ford, a Kentucky Democrat who never graduated from college, finally got a college degree the other day.
Sen. Wendell Ford, the Kentucky Democrat who is chairman of the Senate aviation subcommittee, never held a hearing on her nomination.