Massachusetts Gov. Mitt Romney is poised to announce his campaign for the 2008 Republican presidential nomination in two phases early next month, a top adviser told The Associated Press on Friday. The Massachusetts chief executive is expected to file paperwork as early as Jan. 2 with the Federal Election Commission, establishing a presidential campaign committee and permitting himself to begin raising money for his race on the first business day of the new year. Romney will leave office on Jan. 4. As soon as the week of Jan. 8, Romney will hold a ceremony to officially declare his candidacy, said the adviser, a top aide who spoke on condition of anonymity in advance of the official filing.