WEST ALLIS, Wis., Sept. 3 -- President Bush and Democrat John F. Kerry entered the final stage of the White House race Friday with the incumbent savoring a successful convention week and the challenger faulting Bush for presiding over a loss of jobs. At the unofficial start of the fall campaign, the two sides squabbled over a Labor Department report, released in the morning, showing that 144,000 jobs were created in August while the overall unemployment rate ticked downward -- a performance that was better than July's level but slightly below the number of new jobs that economists had expected....