OSEVILLE, Mich., Feb. 1 — With the Democratic presidential candidates campaigning across the country on Sunday, the chairman of the Democratic National Committee accused President Bush of being AWOL during his Air National Guard service, a signal of the ferocious campaign ahead once the Democrats finish with one another. Revisiting an issue that arose briefly at the end of the last presidential election, the chairman, Terry McAuliffe, said he expected Mr. Bush's record of military service in the 1970's to become an issue this fall, particularly if the Democrats nominate the front-runner, Senator John Kerry of Massachusetts. Mr. McAuliffe said...