Former Rep. Jim Jones' withdrawal from the race for chairman of the Democratic National Committee clears the field for former Jesse Jackson aide Ronald Brown to assume the top party job next month. Jones became the last opponent of Brown to drop out of the race Monday, when he conceded Brown had enough votes on the 404-member committee to assure his election on Feb. 10. "I don't see prolonging a campaign that is outvoted," Jones said. Brown's election to the top Democratic Party job was assured last week when three other rivals for the post dropped out and endorsed him.