ALBANY, N.Y. (AP) _ Sen. Charles Schumer has a big lead over state Attorney General Eliot Spitzer for the 2006 Democratic nomination for governor while Sen. Hillary Rodham Clinton could face a tough battle for re-election that year, a statewide poll reported Wednesday. Despite the encouraging numbers, a spokesman for Schumer said running for governor is ``not on his radar screen.'' The poll, from Marist College's Institute for Public Opinion, found former New York City Mayor Rudolph Giuliani leading Clinton, 50 percent to 46 percent, in a hypothetical Senate matchup. The former first lady and Gov. George Pataki were tied...