WASHINGTON - U.S. Rep. Barney Frank, voicing strong support for U.S. Sen. John Kerry's presidential ambitions, yesterday urged former Vice President Al Gore to stay out of the 2004 White House race "Gore would lose," Frank said. "I don't think he should run ... His negatives are too high." As Kerry officially created his presidential exploratory committee, Frank, D-Newton, said Gore lacks the political popularity to topple President Bush - who is riding a wave of favorability as he pursues the war on terrorism. Frank stressed he wasn't blaming Gore, but simply recognizing a political reality Democrats must confront. "Gore...