ALBANY, N.Y. -- Sen. Hillary Rodham Clinton leads Secretary of State Condoleezza Rice in a hypothetical presidential matchup, an independent poll released Friday shows. The poll, conducted by Marist College's Institute for Public Opinion with New York City television station WNBC, gave the former first lady 50 percent to 41 percent for Rice. But Republicans John McCain and Rudolph Giuliani both topped Clinton. Clinton, McCain and Giuliani are all considered potential 2008 presidential candidates. Rice has said she will not run. The poll, mirroring other recent national surveys, had Clinton as the clear front-runner for the 2008 Democratic nomination, favored...