Not only has Sen. John Edwards sagged as a 2004 Democratic presidential candidate, but his national party operatives now worry about his chances for re-election to a second Senate term in North Carolina next year. Democratic insiders complain that Edwards, a 49-year-old political newcomer, has reached for too much, too soon instead of solidifying his North Carolina base following his election in 1998. Republican Rep. Richard Burr is rated as no worse than even in a 2004 Senate contest. A footnote: Sen. Bob Graham of Florida, who is recovering from heart surgery performed Jan. 31, is becoming the top presidential...