Iowa Gov. Tom Vilsack, a centrist Democrat seeking an early edge in an all-but-certain crowded presidential field, launched a long-shot bid for the White House Thursday. Fifteen months before his own state holds caucuses - the first step in the nominating process - Vilsack announced his candidacy, filed documents with the Federal Election Commission and heralded a multistate tour beginning Nov. 30. The governor is the first Democrat to file for the presidency although a number of better known candidates are presumed to be running. "Americans sent a clear message on Tuesday. They want leaders who will take this country...