PHOENIX, Oct. 10 — Gen. Wesley K. Clark announced a raft of top appointments to his presidential campaign on Friday, just days after simmering tensions inside the fledgling organization led to the resignation of his campaign manager. Several of the new appointees are veterans of the Clinton administration. And the campaign has entered discussions with former Vice President Al Gore's campaign spokesman, Chris Lehane, who recently left the presidential campaign of Senator John Kerry of Massachusetts. Clark campaign officials said that with the appointments, the campaign was setting firm lines of authority and would become a more stable operation,...