TOM SUOZZI Photo: Mary McLoughlin ALBANY — Nassau County Executive Tom Suozzi will today deliver a major speech on abortion — attempting to position himself in the political middle should he decide to challenge Eliot Spitzer for governor or seek another statewide office. Suozzi, a pro-choice Democrat, will outline a three-year, $3 million plan to curtail abortions, including programs to assist women who have out-of-wedlock births. Suozzi, a Roman Catholic, is expected to seek "common ground" with anti-abortion activists in the speech at Adelphi University in Garden City by emphasizing prevention, adoption services and help for unwed mothers........ "He's...