NEWSWEEK POLL: REPUBLICAN CONVENTION 2004 Bush/Cheney Lead Kerry/Edwards 54 to 43 Percent; in a Three-Way Trial Heat, Bush/Cheney Receive 13-Point Margin Bouncebr Bush Approval Rating Rises to 52 Percent; First Time Above 50 Since January; Majority (53%) Wants to See Him Re-Elected-Highest Since May 2003